TB820D Right Angle Scattered Light Turbidity Detector

User’sManual TB820D

Right Angle Scattered Light Turbidity Detector

IM 12E01B30-02EN

IM 12E01B30-02EN3rd Edition

i

IM 12E01B30-02EN

<INTRODUCTION>

3rd Edition : Oct. 14 , 2021-00

u INTRODUCTIONThank you for purchasing TB820D Right Angle Scattered Light Turbidity Detector, FLXA402T Liquid Analyzer for Turbidity and Chlorine.This User’s Manual contains all essential information for the user to make full use of TB820D and FLXA402T.Please read the following respective documents before installing and using the instrument.The related documents are listed as follows.General Specifications

Contents Document number NoteTB820D, FLXA402T Right Angle Scattered Light Turbidity Analyzer GS 12E01B30-01EN Online manual

“EN” in the document number is the language code.

User’s ManualContents Document number Note

TB820D Right Angle Scattered Light Turbidity DetectorStart-up and Safety Precautions

IM 12E01B30-01EN Attached to the product (printed manual)

TB820D Right Angle Scattered Light Turbidity Detector IM 12E01B30-02EN Online manual (this manual)

FLXA402T Liquid Analyzer for Turbidity and ChlorineStart-up and Safety Precautions

IM 12A01G01-01EN Attached to the product (printed manual)

FLXA402T Liquid Analyzer for Turbidity and ChlorineInstallation and Wiring

IM 12A01G01-02EN Online manual

FLXA402T Liquid Analyzer for Turbidity and ChlorineOperation of Converter


FLXA402T Liquid Analyzer for Turbidity and ChlorineOperation of pH


FLXA402T Liquid Analyzer for Turbidity and ChlorineOperation of SC



An exclusive User’s Manual might be attached to the products whose suffix codes or option codes contain the code “Z” (made to customers’ specifications). Please read it along with this manual.Technical Information

Contents Document number NoteFLXA402T Liquid Analyzer for Turbidity and ChlorineMODBUS Communication

TI 12A01G01-62EN Online manual


You can download the latest documents from our website. Scan QR code.http://www.yokogawa.com/an/flxa402t/download/

Refer to each corresponding manual for other related products.

No.IM 12E01B30-02EN 3rd Edition: Oct. 2021 (YK)All Rights Reserved Copyright © 2021, Yokogawa Electric Corporation

https://web-material3.yokogawa.com/GS12E01B30-01EN.pdf

https://web-material3.yokogawa.com/IM12E01B30-01EN.pdf

https://web-material3.yokogawa.com/IM12E01B30-02EN.pdf

https://web-material3.yokogawa.com/IM12A01G01-01EN.pdf





https://web-material3.yokogawa.com/TI12A01G01-62EN.pdf

http://www.yokogawa.com/an/flxa402t/download/

ii

IM 12E01B30-02EN

<INTRODUCTION>

3rd Edition : Oct. 14 , 2021-00

n Notes on Handling User’s Manuals• Please hand over the user’s manuals to your end users so that they can keep the user’s

manuals on hand for convenient reference.• Please read the information thoroughly before using the product.• The purpose of these user’s manuals is not to warrant that the product is well suited to any

particular purpose but rather to describe the functional details of the product.• No part of the user’s manuals may be transferred or reproduced without prior written

consent from YOKOGAWA.• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at

any time, without notice or obligation.• If you have any questions, or you find mistakes or omissions in the user’s manuals, please

contact our sales representative or your local distributor.

n Drawing ConventionsSome drawings may be partially emphasized, simplified, or omitted, for the convenience of description.Some screen images depicted in the user’s manual may have different display positions or character types (e.g., the upper / lower case). Also note that some of the images contained in this user’s manual are display examples.

n Terminology● Turbidity meter, Turbidity analyzer: TB820D + FLXA402T● Detector, Detection unit: TB820D detector, TB820D Detection unit● Converter or liquid analyzer: FLXA402T

n Trademark Acknowledgements• FLEXA, FLXA and SENCOM are trademarks or registered trademarks of Yokogawa Electric

Corporation.• All other company and product names mentioned in this user’s manual are trademarks or

registered trademarks of their respective companies.• We do not use TM or ® mark to indicate those trademarks or registered trademarks in this

user’s manual.

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<CONTENTS>

3rd Edition : Oct. 14 , 2021-00

TB820DRight Angle Scattered Light Turbidity Detector

CONTENTS

IM 12E01B30-02EN 3rd Edition

u INTRODUCTION .............................................................................................i1. OVERVIEW ................................................................................................ 1-1

1.1 Measurement system and structure ...............................................................1-11.2 Part Name and Functions ................................................................................1-21.3 Specifications ....................................................................................................1-21.4 Model and Codes ..............................................................................................1-31.5 External Dimensions ........................................................................................1-41.6 Measurement principle .....................................................................................1-4

2. INSTALLATION, PIPING, AND WIRING ..................................................... 2-12.1 Wiring .................................................................................................................2-2

2.1.1 SENCOM cable for turbidity and chlorine (A) .................................... 2-62.1.2 Power cable for FLXA402T (B) ..........................................................2-62.1.3 Power supply cable (C) ......................................................................2-62.1.4 Wiring with PG400 .............................................................................2-72.1.5 When Relay box for solenoid valve is included ................................. 2-7

2.2 Piping .................................................................................................................2-92.2.1 System Using an Open Head Tank (/D3) .......................................... 2-92.2.2 A system using a Simple head tank (/D2) .......................................2-122.2.3 System Using a Pressurized Head Tank (/D1) ................................2-142.2.4 System without a Head Tank ...........................................................2-17

3. PREPARATION for OPERATION ............................................................. 3-13.1 Piping and Wiring Check ..................................................................................3-13.2 Confirming detector condition ..................................................................................... 3-13.3 Supplying Power and switching operation mode ...................................................... 3-13.4 Filling zero water and Test operation..............................................................3-23.5 Setting Operation Parameters .........................................................................3-23.6 Calibration .........................................................................................................3-23.7 Supplying a Sample and Adjusting the Flow Rate ........................................3-33.8 Adjusting ultrasonic power .............................................................................3-43.9 Switching to measurement mode ...................................................................3-4

4. SETTING PARAMETERS ......................................................................... 4-14.1 Measure setting .................................................................................................4-3

4.1.1 Negative value non output .................................................................4-34.1.2 Turbidity unit select ............................................................................4-3

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4.1.3 Meas. damping time constant, Maint. damping time constant .......... 4-34.1.4 Turbidity warning High/Low limit ........................................................4-34.1.5 Air denoising setting ...........................................................................4-3

4.2 Cal./Maint. Settings ...........................................................................................4-64.2.1 Turbidity value of check tool ...............................................................4-64.2.2 Zero shift value, Correction factor ...................................................... 4-64.2.3 Stability check ....................................................................................4-64.2.4 Wash/Cal. box ....................................................................................4-64.2.5 Ultrasonic wash ..................................................................................4-64.2.6 Calibration setting others ...................................................................4-7

4.3 Diagnosis setting ..............................................................................................4-74.3.1 Light source diagnosis .......................................................................4-74.3.2 Dried condition diagnosis ...................................................................4-74.3.3 Operating days ...................................................................................4-7

4.4 Communication setting ....................................................................................4-74.5 Auto Wash/Calibration setting ........................................................................4-8

4.5.1 Auto sequence for wash/cal. ..............................................................4-84.5.2 Start date ............................................................................................4-84.5.3 Auto Wash/Calibration function and wash type ................................. 4-84.5.4 Auto sequence setting .......................................................................4-8

5. FLXA402T sensor menu .......................................................................... 5-15.1 WASH .................................................................................................................5-25.2 Calibration .........................................................................................................5-25.3 Detail ...................................................................................................................5-25.4 Reset op. time ....................................................................................................5-55.5 Setting ................................................................................................................5-55.6 Maintenance ......................................................................................................5-6

6. OPERATION .............................................................................................. 6-16.1 Turbidity measurement ....................................................................................6-16.2 Air denoising .....................................................................................................6-16.3 When Sample Water Supply is Cut Off ...........................................................6-16.4 Automatic wash/Automatic calibration Operation ........................................ 6-16.5 Stop and restarting operation .........................................................................6-1

7. CALIBRATION ........................................................................................... 7-17.1 Turbidity calculation and calibration menu ...................................................7-27.2 Turbidity standards ...........................................................................................7-37.3 Zero Calibration .................................................................................................7-77.4 Slope calibration (Check tool) .........................................................................7-87.5 Slope calibration (Standard solution) .............................................................7-87.6 Auto zero calibration ........................................................................................7-97.7 Zero shift correction .........................................................................................7-97.8 Sensitivity correction .......................................................................................7-97.9 2 points correction ..........................................................................................7-10

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7.10 Basic (reference) sensitivity calibration ....................................................... 7-117.11 Calibration Error .............................................................................................. 7-11

8. MAINTENANCE ......................................................................................... 8-18.1 Washing the Flow cell .......................................................................................8-28.2 Washing the Head Tank ....................................................................................8-38.3 Checking and Replacing Desiccants ..............................................................8-48.4 Pipe Cleaning ....................................................................................................8-48.5 Replacing the Zero Turbidity Filter Element .................................................. 8-58.6 LED Replacement .............................................................................................8-68.7 Fuse Replacement ............................................................................................8-88.8 Window glass replacement............................................................................8-108.9 Flow cell replacement .....................................................................................8-14

9. TROUBLESHOOTING .............................................................................. 9-19.1 When an error occurs .......................................................................................9-19.2 When No Error Indication Appears .................................................................9-3

APPENDIX .................................................................................................................iCustomer Maintenance Parts List ................................... CMPL 12E01B30-01ENRevision Information ...............................................................................................i

Blank Page

<1. OVERVIEW> 1-1

IM 12E01B30-02EN 3rd Edition : Oct. 14 , 2021-00

1. OVERVIEWTo keep good quality in industrial or drinking water and rivers or streams, “Turbidity” is one of the important measurement parameters to control water quality.Turbidity analyzer is more than ever demanded not only for water treatment, but currently for measurement/detection of suspended substances in industrial waste or of turbidity at chemical processing facility.Since their sales began in 1959, Yokogawa turbidimeters have been continuously developed and improved using various measurement principles suited for various applications. With its many achievements, Yokogawa has earned its customers’ confidence. Right Angle Scattered Light Turbidity Analyzer, composed of Turbidity Detector TB820D and Liquid Analyzer FLXA402T, is a next-generation analyzer, developed based on years of experience, combining the reliable measurement principle with our latest digital sensor technology realizing high efficiency in facility operations.FLXA402T is a converter designed, being tailored from the well-received FLXA402, to provide multiple detector measurements. In addition to conventional analog output, Modbus TCP, Modbus RTU/RS485 are available.The technology of predictive maintenance prevents accidental shutdown of the factory and reduces OPEX. TB820D has drastically improved maintainability and minimized maintenance time.

1.1 Measurement system and structureTB820D is used with FLXA402T Liquid Analyzer for Turbidity and Chlorine. TB820D also can be used with a sampling system to control the pressure or flow rate of samples.

l TB820D Right Angle Scattered Light Turbidity DetectorTB820D measures turbidity. The Detection unit consists of the following three parts.

● Flow cell: Sample flows through it.● Detection unit: Optical system incorporating Light source and Receiver

● Smart unit: Memory of parameters, the control unit

l FLXA402T Liquid Analyzer for Turbidity and Chlorine (converter)The FLXA402T Liquid Analyzer for Turbidity and Chlorine output/displays measurement or status of connected detectors.Refer to IM 12A01G01-03EN for the setup of the display, input/output, or communication.

l Sampling SystemSample introduced into TB820D needs to be free from air bubbles by using a Head tank to stabilize the pressure in piping and the flow rate. Use the sampling system if necessary.


<1. OVERVIEW>1-2


1.2 Part Name and Functionsn TB820D Turbidity detector

Top coverDetection unitFlow cell

Smart unit

Smart unit coverFront cover

Sample water outlet

LED

Sample water inletDrain

Fuse

1.3 SpecificationsSee TB820D General Specification GS 12E01B30-01EN.


<1. OVERVIEW> 1-3


1.4 Model and Codesn Model and Suffix Codes

TB820D Right Angle Scattered Light Turbidity Detector

Model Suffix code Optioncode Description

TB820D ············································· ········· Right Angle Scattered Light Turbidity DetectorLight source

-NT-FN

········· 660nm, Formazin, 0-0.2 NTU to 0-500 NTU860nm, Formazin, 0-0.2 FNU to 0-700 FNU

Type -AB-AD-AG-AJ

····································

General purpose for CE, RCM, China standardGeneral purpose for CSAGeneral purpose for KCGeneral purpose

Relay box for solenoid valve

-NN-A5

··················

Without relay box for solenoid valveRelay box for solenoid valve

Ultrasonic cleaning -NN-U1

··················

Without ultrasonic cleaningOscillator for ultrasonic cleaning

Check tool -CT ········· With Check tool― -NN ········· Always -NNOption /L02

/L03/L05/L10/L20/SCT/U/CB3/CD3/CF3/D1/D2/D3/TC/TCN/NPT

Connection cable for analyzer 2 mConnection cable for analyzer 3 mConnection cable for analyzer 5 mConnection cable for analyzer 10 mConnection cable for analyzer 20 mStainless steel tag platePipe mounting hardware (SUS)Conduit adapter G1/2×3 pcsConduit adapter 1/2 NPT×3 pcsConduit adapter M20×1.5×3 pcsPressurized head tank for low turbidity (for 2 NTU or less)Simple head tank (for over 2 NTU to 10 NTU)Head Tank (for over 2 NTU)One-touch connector (8 mm OD)One-touch connector (1/4 inch OD)ANSI standard connection

l AccessoriesName Q´ ty Remarks

Desiccant 1 4 pcs/Q’ty (Part number: K9657RJ) Check tool 1Silicone Cloth 1Plug 2

l Spare partsName Part No. Description Q´ ty Frequency of Replacement

LED (red light) K8003DN for -NT, 660 nm Light source 1 3 yearsLED (Infrared light) K8003DP for -FN, 860nm Light source 1 3 yearsDesiccant * K9657RJ 1 YearlyGasket K8003NR 1 YearlyFUSE A1633EF 1 (*1)FUSE A1624EF for -A5 2 (*1)Filter Element, 1 μm K9008ZD 1 Yearly Filter Element, 0.2 μm K9726EH 1 Yearly

(*1) Use within a year after purchasing.

<1. OVERVIEW>1-4


l Head TankName Part No. Description

Pressurized head tank for low turbidity K8003WA 2 NTU or less, same as option code /D1Simple head tank K8003YA over 2NTU to 10NTU, same as option code /D2Head tank K9658MR over 2 NTU, same as option code /D3

1.5 External DimensionsSee TB820D General Specification GS 12E01B30-01EN.

1.6 Measurement principleTB820D Turbidity detector uses the right angle scattered light method to continuously measure the turbidity of your samples. When Sample is irradiated with light, the incident light is scattered by the turbidity particle.TB820D measures turbidity by using 660 nm or 860nm monochromatic light as the light source and detecting light scattered in the sample in the 90-degree direction.Scattered light intensity is calculated by light source intensity, turbidity and the structural parameter of the unit. The equation is as follows.Ls = K · Q · S Where: Ls: Scattered light intensity K: Structural parameter (constant) Q: light source intensity S: TurbidityTB820D continuously monitors the scattered light intensity (Ls) and light source intensity (Q) and calculates the turbidity (S).


<2. INSTALLATION, PIPING, AND WIRING> 2-1

IM 12B01B30-02EN 3rd Edition : Oct. 14 , 2021-00

2. INSTALLATION, PIPING, AND WIRINGn Installation Location

The TB820D turbidimeter should be installed in a location:• that is protected from direct sunlight and rain, i.e., the instrument should be installed indoors

or in a cubicle;• that is subject to minimal mechanical vibration;• where no corrosive gases are present;• that is not exposed to high temperature and humidity. The temperature should be in the

range of -5 to 55°C, preferably at or around normal temperatures, and its fluctuation small. The humidity should be kept between 10 to 90%RH. Prevent condensation which may occur if the sample temperature is lower than the ambient temperature. Also, take protective measures to prevent a sample and the tap water from freezing, if necessary;

• that provides adequate maintenance space and easy access for maintenance work; and,• where the drain is provided.

n Installation DimensionsInstall the TB820D’s detector unit in pipes or walls using their special mounting brackets, respectively. Note that these mounting brackets are supplied only when specified.

l Pipe Mounting (Option Code “/U”)For information on the converter, read FLXA402T IM.

54 141

128 Unit: mm

Mounting 2-inch pipe(ø60.5)

l Wall Mounting (Install the detector with four M5 screws)For information on the converter, read FLXA402T IM.

100

2-R3

2-R3

160

Unit: mm

<2. INSTALLATION, PIPING, AND WIRING>2-2


2.1 WiringSee Figure 2.1 or Figure 2.2 for wiring of TB820D.For external wiring of FLXA402T, read FLXA402T Operation of Converter IM 12A01G01-02EN section 2.5.

(201)L(202)N(002)G

U1U2U3

S

LNG

(32)NC(31)C(33)NO

S1

(42)NC(41)C(43)NO

S2

(72)NO(71)C(73)NC

S4

(61) +(62) -mA1

(65) +(66) -mA2

(81) +(82) -mA3

(85) +(86) -mA4

(21)(22)(24)

SHLD(63)

(87) +(88) -

SHLD(89)

A+(91)B-(92)

GND(93)SHLD(94)

Termination(95)

(52)NC(51)C(53)NO

S3

Power

2nd input(-TB, -P1, -C1)

1st input

(82)SHLD(86)GND(83)B-(84)A+(87)V5

L(101)N(102)G(001)

Power

Ultra Sonic

Converter

RELAY

SENCOM

InternalUS terminal

L(301)N(302)G(003)

L1L2

G

*2

*2

*3*3

TB820D-□□-□□-NN

FLXA402TLiquid Analyzer for Turbidity and Chlorine

Analog output (-N2, -N4)


Analog output (-N4)

Analog output (-N4)

Contact input (-N2, -N4)

Analog input (-N4)

RS485 (-R)

Ethernet (-E)Contact output

(-WR)


PG400Pulse Generator for Clean Unit

Powersupply

*1

*1: Power terminal "G" on TB820D must be grounded (ground resistance: 100 ohm or less). In case of selecting -NN as Relay box for solenoid valve, power supply cable connects with L(101), N(102) and G(001) in TB820D.*2: The connection cables are 1 m in length normally. They are available with /L02, /L03, /L05, /L10 or /L20 depending on the length you need.*3: When suffix code -U1 is specified, PG400 should be purchased separately. Neither Ultrasonic oscillator cables nor power cable are supplied with the product. Purchase them separately. See GS 19C01B05-01EN.

Power supply cable (C) Power cable for FLXA402T (B)

SENCOM cable for Turbidity and chlorine (A)

Power cable for PG400 Oscillator cable

Figure 2.1 Wiring TB820D-□□-□□-NN




(201)L(202)N(002)G

U1U2U3

S

LNG

(32)NC(31)C(33)NO

S1

(42)NC(41)C(43)NO

S2

(72)NO(71)C(73)NC

S4

(61) +(62) -mA1

(65) +(66) -mA2

(81) +(82) -mA3

(85) +(86) -mA4

(21)(22)(24)

SHLD(63)

(87) +(88) -

SHLD(89)

A+(91)B-(92)

GND(93)SHLD(94)

Termination(95)

(52)NC(51)C(53)NO

S3

Power

2nd input (-TB, -P1, -C1)

1st input

(82)SHLD(86)GND(83)B-(84)A+(87)V5

L(101)N(102)G(001)

Power

Ultra Sonic

Converter

RELAY

SENCOM

InternalUS terminal

L(301)N(302)G(003)

L1L2

G

(12)(13)

L(101)N(102)G(001)

Power

L(201)N(202)G(002)

Detector

L(301)N(302)G(003)

Converter

(21)(22)

Wash

Measure

(31)(32)Zero

(41)(42)

Drain

CN1

SV1 *4

SV2 *4

SV3 *4

SV4 *4

*2

*2

*3*3

TB820D-□□-□□-A5

FLXA402TLiquid Analyzer for Turbidity and Chlorine



Analog output (-N4)

Analog output (-N4)

Contact input (-N2, -N4)

Analog input (-N4)

RS485 (-R)

Ethernet (-E)Contact output

(-WR)


PG400Pulse Generator for Clean Unit

Powersupply

*1

Power supply cable (C) Relay box

*1: Power terminal "G" on Relay box must be grounded (ground resistance: 100 ohm or less). In case of selecting -A5, power supply cable connects with L(101), N(102) and G(001) in Relay box.*2: Connection cables are 1 m in length normally. They are available with /L02, /L03, /L05, /L10 or /L20 depending on the length you need.*3: When suffix code -U1 is specified, PG400 should be purchased separately. Neither Ultrasonic oscillator cables nor power cable are supplied with the product. Purchase them separately. See GS 19C01B05-01EN. *4: In case of selecting -A5, purchase the solenoid valve corresponding input power supply and frequency. See ● Solenoid valve (SV1 to SV4).

Cable for SV (F)

Power cable for FLXA402T (B)


Cable for Relay box control

Power cable for Smart unit (D)

Power cable for PG400

Oscillator cable

Figure 2.2 Wiring TB820D-□□-□□-A5

CAUTIONTurn off power supply to TB820D before wiring. Power rating must comply with TB820D specifications. Power voltage must match with the one indicated on the name plate.



WARNING● You must install external power supply switch or circuit breaker for power supply.● The external power supply switch or a circuit breaker must comply with a current rating of

5Aor IEC60947-1 or IEC60947-3● Yokogawa recommend installing the external power supply switch, circuit breaker and

TB820D all in the same location.● Install the external power supply switch or circuit breaker to the place where operators

access easily. To alert users, put a label on the external power switch.● Fix securely onto constructions or walls all power lines including wire cables of power supply

by using stanchion, cable rack, conduit or vinyl band. Unplugged cables are dangerous and may cause an electric shock.

CAUTION● When you open the front cover, make sure the screws are completely out of the screw

holes, and then open the front cover slowly in order not to damage the threaded parts on the housing. If the threaded parts are damaged and the screws cannot be tightened, the waterproof performance will deteriorate.

● Don’t lose the four screws of the front cover.

When wiring TB820D, first remove the cover of the smart unit. Provide the wiring with the cover removed. The product is shipped with cable gland attached to the cable entry.When protecting cables with conduits, use conduit adapters (option code: /CB3, /CD3, /CF3)For how to provide conduit adapters, see FLXA402T Installation and Wiring IM 12A01G01-02EN section 2.4.




clamp


Cable for Relay box control (E)

Power cable for PG400

Smart unit

Detection unitOscillator cable


Power supply cable (C)

View from the bottom

Figure 2.3 Wiring TB820D Smart unit side

LN

G

For IO moduleFor sensor modules

For relay module

For COM module



M3 screw

M4 screw

Figure 2.4 Wiring FLXA402T side

WARNINGNever let the power cable touch SENCOM cable, resulting in failure to comply with safety requirements.



WARNING● Use wiring cables with heat resistance above 75 °C, waterproof rating IP65 or higher.● Tightening torque to the four screws of Smart Box cover is 1.4 N·m.● For power supply, wire cables with a flammability rating of UL 2556 VW-1 or equivalent

CAUTION• When you open the front cover of FLXA402T, make sure the screws are completely out of

the screw holes, and then open the front cover slowly in order not to damage the threaded parts on the housing. If the threaded parts are damaged and the screws cannot be tightened, the waterproof performance will deteriorate.

• Be careful not to lose the four screws on the front cover of the FLXA402T.

2.1.1 SENCOM cable for turbidity and chlorine (A)Dedicated cable is supplied with the product. For the wiring of FLXA402T, read FLXA402T Installation and Wiring IM 12A01G01-02EN section 2.6.1.

2.1.2 Power cable for FLXA402T (B)Dedicated cable is supplied with the product. Both ends are terminated at different lengths. Connect the longer one (approx. 80 mm) to Smart unit side, the shorter one (approx. 50 mm) to FLXA402T side.Cables have no name on them so wire them by color: L; Black, N; White, G; Red.Fasten the M3 screw (L, N) (Figure 2.8) with the tightening torque of 0.6 N·m, M4 screw (G) with 1.4 N·m.

2.1.3 Power supply cable (C)

WARNING● You must install external power supply switch or circuit breaker for power supply.● The external power supply switch or a circuit breaker must comply with a current rating of

5Aor IEC60947-1 or IEC60947-3● Yokogawa recommend installing the external power supply switch, circuit breaker and

TB820D converter all in the same location.● Install the external power supply switch or circuit breaker to the place where operators

access easily. To alert users, put a label on the external power switch.● Fix securely onto constructions or walls all power lines by using cable rack, conduit or vinyl

band. Unplugged cables are dangerous and may cause an electric shock.

Provide the smart unit with a power supply whose voltages and frequencies conform to the specifications. Grounding wiring also must be made to prevent electric shock and to prevent the instrument from being affected by noise. Power supply and grounding cable must be provided by customers. The specification of the cables is described in the following table.




Table2.1 Specification of power cableRated voltage 300V or aboveRated temperature 75°C or aboveNumber of cores, Wire diameter 3

L, N, G: 0.75 to 2.5 mm2 (AWG18 to14)Sheath outer diameter Ø6.5 to Ø12.5 mmCable termination Strip the outer sheath of 80 mm, provide the termination.

L, N: M3 round terminalG: M4 round terminal

Connect the power supply cable to the terminal. Refer to Figure 2.8.This instrument does not have a power supply switch. The power supply line must be equipped with a double switch. Grounding wiring connected to the smart unit shall satisfy Class D (grounding resistance: 100 Ω or less). Fasten the M3 screw (L, N) with the tightening torque of 0.6 N·m, M4 screw (G) with 1.4 N·m. (Figure 2.8)

2.1.4 Wiring with PG400When the suffix code -U1 (Ultrasonic cleaning) is specified, PG400 Pulse Generator for Clean Unit is supplied with the product.For PG400, read PG400 User's Manual IM 19C01B05-01EN.Provide wiring of Oscillator cable and Power cable for PG400, by referring to Figure 2.1 or Figure 2.2-Figure 2.3.Connect the Cable for PG400 to Detection unit, not to Smart unit of TB820D.Connect the connector as shown on the left in Figure 2.5 and thread it through the clamp as shown on the right. Make sure that the connector part is above the clamp. Run the cable along the side of the housing and lay it in the back.

clamp

Figure 2.5 Cable for PG400

2.1.5 When Relay box for solenoid valve is includedWhen the suffix code -A5 (Relay box for solenoid valve) is specified, a Relay Box is included as shown in the Figure 2.2. Wire the cables of Power cable for Smart unit (D), Cable for Relay box control (E), and Cable for SV (F).

Ground Terminal

101102

201202

301302

Power supply cable (C)

Cable for SV (F)


View from the bottom

Cable for SV control (E)

Power cable for Smart unit (D)

SV3 cable

SV2 cableSV1 cable

SV4 cable

Figure 2.6 Wiring Relay Box



n Power cable for Smart unit (D)Dedicated cable is supplied with the product.

Table 2.2 Power cable for Smart unit Cable color Relay Box terminal No. Smart Unit terminal No.

Black (L) 201 101White (N) 202 102Red (G) 002 001

Fasten the M3 screw (L, N) with the tightening torque of 0.6 N·m, M4 screw (G) with 1.4 N·m. (Figure 2.6)

n Cable for Relay box control (E)Dedicated cable is supplied with the product.Connect to the designated connector by referring to Figure 2.2, Figure 2.6.

n Cable for SV (F)Solenoid valve and solenoid valve cable are provided by customers. See Table 2.4 and Table 2.7 for the required specifications. Yokogawa also provides these products.Solenoid valve is not supplied with Relay box for solenoid valve. Purchase separately an appropriate solenoid valve.

Table 2.4 Requirement for sampling system

Port size Valve type Max. working pressure

Max. Working pressure differential

SV1 Rc 1/2 N.O.(*1) ≥ 1.5 MPa ≥ 0.7 MPaSV2, 3 Rc 1/4 N.C. (*2) ≥ 5.0 MPa ≥ 0.4 MPaSV4 Rc 3/8 N.C. (*2) ≥ 2.0 MPa ≥ 1 MPa

*1: Valve closes when energized.*2: Valve opens when energized.

Table 2.5 Example

Voltage 100 V 200 V 220 VSV1 Part number B1043ET B1045ET B1046ET

Model code VXZ2B2GH VXZ2B2GK VXZ2B2GZ1GManufacturer SMC Corporation

SV2, 3 Part number B1035ET B1037ET B1038ETModel code AB41-02-6-

D2GSAC100V-STAB41-02-6-

D2GSAC200V-STAB41-02-6-

D2GSAC200V-STManufacturer CKD Corporation

SV4 Part number B1031ET B1033ET B1034ETModel code ADK11-10A-

D2GSAC100V-STADK11-10A-

D2GSAC200V-STADK11-10A-

D2GSAC220V-STManufacturer CKD Corporation

Table 2.6 Recommended cable for solenoid valve

Part number K8004TH (for SV1), K8004TJ (for SV2), K8004TK (for SV3), K8004TL (for SV4)Cable length 1.2 mRated voltage 300 VSpecification AWG20 2-core cable, M3 round terminal



Table 2.7 Specification of Solenoid valve cableCable length (*) 3000 mm or less (*1)Rated voltage 300V or aboveRated temperature 75°C or aboveSpecification AWG 20 2-core cableSheath outer diameter Ø6.5 to Ø12.5 mmCable termination On the terminals of Terminal Box, strip the outer sheath

of 80 mm, provide the termination M3 round. On the solenoid valve terminals, the cable termination varies depending on the type of terminal.

(*) The specification shall be satisfied to comply with EMC regulation.

Connect the cable for SV by referring to Figure 2.2 and Figure 2.7.

2.2 PipingThere are three piping methods in accordance with the system configuration.

(1) A system using an open head tank (/D3)(2) A system using a Simple head tank (/D2)(3) A system using a pressurized head tank (/D1) (4) A system without a head tank

Depending on the application, select the appropriate system configuration, and install pipes accordingly following the procedure described below.

2.2.1 System Using an Open Head Tank (/D3)This is a typical system and the piping diagram is shown in Figure 2.20. Air bubbles in a sample are removed by an open head tank and the sample is introduced into the detector at a stable flow rate. Calibration and maintenance such as measurement cell cleaning are efficiently performed by valve operation. An optional Open head tank (option code “/D3”), shown in Figure 2.20, is available from Yokogawa.

Approx.288

4-ø6.2 holes(for fixing)

40

9.5

Approx.205

2-Ø10 holes(for fixing)

Ø26/Ø19 PE tube coupling

Ø22/Ø15 PE tube couplingHead tank sample inlet 110

320

Drain

70

280110

VP20 PipeHead pipe drain

Ø22/Ø15 PE tube Coupling

Sample outlet

Sample inlet Ø22/Ø15PE tube coupling

30

Unit: mm

Figure 2.20 Open Head Tank (/D3)



h

HF3-29E.ai

Sample WaterInlet

Drain Port

Sample WaterOutlet

Detector

Drain Valve

SampleWater

TapWater

Sample WaterValve

Zero TurbidityFilter

Sample Water Supply Valve

Zero Water Supply ValveTap WaterValve

DrainValve

Drain

Drain

Drain

Drain

Sample Water

Sample Water Effluent

Zero Water Drain Valve

Other Turbidity Detectors

Zero Water

Head TankFlow Control Valve

Figure 2.21 Piping Diagram (/D3)

(1) Piping of the Sample Line to the Detector

This piping is for introducing a sample into the measurement cell of the detector. Install a head tank, valves and pipes by referring to the diagram in Figure 2.21.1. For the piping to a head tank, use a hose/tube with sufficient diameter that provides

adequate flow of sample in order to prevent clogging. If pressure exists in a sample, use an appropriate tube that can withstand the pressure, e.g., a rigid PVC tube.

2. To the sample inlet of the detector, attach a 3-way (tee) or appropriate fitting corresponding to the inlet’s connection size (Rc1/2 or 1/2 NPT). This allows switching of the sample flow and the zero water flow.

3. Connect a sample supply valve to one end of the 3-way tee fitting, and then connect a hose/tube with sufficient diameter that provides adequate flow of sample between the valve and the head tank.

4. Although the specified flow rate of the detector is in the range of 1 to 10 L/min, the actual flow rate should be at least 2 L/min by adjusting the head difference (H) of the head tank and selecting a hose/tube with appropriate diameter. This is due to the following reasons.• To increase the flow rate in the measurement cell of the detector to allow suspended

matter to disperse uniformly.• To prevent suspended matter to accumulate in the measurement cell.• To dislodge air bubbles from the measurement cell and the measurement window

surface. Depending on the piping method, a flow rate of 5 to 10 L/min is obtained at a head

difference (H) of 1 m with piping with nominal diameter of 16A.5. To prevent clogging or stagnation of air bubbles in the pipeline, install the pipes so that no

bends or stagnation occurs.



(2) Piping of the Sample Line from the Detector

This piping is for draining a sample from the measurement cell of the detector during measurement.1. The sample outlet of the detector is Rc1/2 (or 1/2 NPT female) thread. Install a fitting

corresponding to the thread and connect a hose/tube with sufficient diameter that provides adequate flow of sample, to route the sample from the detector to a drain pipe.

2. As shown in Figure 2.21, the sample from the detector should be discharged to the atmosphere at a point (h) higher than the measurement cell of the detector. If not, a siphon may be created and the measurement cell may not be filled with a sample. In addition, if the sample inflow stops, the sample will be drawn off and the measurement cell will be emptied, which can cause damage to the ultrasonic transducer, if used.

(3) Drain Piping

This piping is for draining a sample from the measurement cell of the detector and a head tank during cleaning, calibration, or other maintenance.1. The drain of the detector is Rc1/2 (or 1/2 NPT female) thread. Install a fitting corresponding

to the thread and connect a hose/tube with sufficient diameter that provides adequate flow of sample, to route the sample from the detector to a drain pipe. Install the pipe so that no bends or stagnation occurs.

2. As shown Figure 2.21, install the pipe so that the sample can be drained from the head tank to the drain pipe during measurement or maintenance.

(4) Piping of the Zero Water Line

This piping is for introducing tap water to a zero turbidity filter and then to the detector for zero calibration or measurement cell cleaning.1. As shown in Figure 2.21, install a tap water valve and a zero water drain valve.2. Connect a zero water supply valve to one end of the 3-way tee fitting attached to the sample

inlet of the detector.3. Install a fitting corresponding to the piping connection of the zero turbidity filter and connect

a hose/tube that can withstand the pressure of tap water, such as a rigid PVC tube. The flow rate of zero water supply should be in the range of 1 to 3 L/min.

4. For the specifications of the zero turbidity filter, see “1.3 Specifications”5. To prevent corrosion of water inside the zero turbidity filter, allow water to flow through

the filter and flow out from the zero water drain valve continuously at a flow rate of approximately 10 mL/min.



2.2.2 A system using a Simple head tank (/D2) An optional simple head tank with a vent to the atmosphere (option code “/D2”), shown in Figure 2.22, is available from Yokogawa. The piping diagram of the simple head tank is shown in Figure 2.23. The installation of and the piping for the simple head tank are described below.

4-ø6

26±5

795

390

(for f

ixin

g ho

le)

64.5

±515

0

±520

5

38 (for fixing hole)

38 (for fixing hole)

±521

0.5

±527

1

±566

±5102 ±567

±5123

±595.5

DrainTS socket typeNominal 20A(ø26.2 ID)

Sample water outlet(to detector)Rp1/2

Sample water inletRc3/8

DrainTube size ø19 IDHose coupling

Vent to the atmosphereTube size ø19 IDHose coupling

Unit: mm

F3-30E.ai

Figure 2.22 Simple Head Tank (/D2)

Drain

Drain Valve

Sample WaterInlet Drain Port

Sample WaterOutlet

Detector

Drain Valve

Sample Water

Tap Water

Sample Water Valve


Sample Water Supply Valve


Drain

Drain

Drain

Sample Water

Simple Head Tank

Zero Water

Vent

Flow Control ValveSample Water Effluent



h

F3-31E.ai




[Installation and Piping of the Simple Head Tank]


2. Install the simple head tank with the four M5 bolts (supplied by customer) so that the head tank is positioned higher than the detector.

3. To the sample inlet (Rc3/8) of the simple head tank, connect a fitting corresponding to the connection size and a hose/tube with sufficient diameter that provides adequate flow of sample. If pressure exists in a sample, use an appropriate tube that can withstand the pressure, e.g., a rigid PVC tube.

If the flow rate of a sample exceeds 10 L/min, install a bypass line before the simple head tank to control the flow rate.

4. Connect a fitting corresponding to the connection size and a hose/tube with sufficient diameter that provides adequate flow of sample between the sample outlet (Rc1/2) of the simple head tank and the sample inlet of the detector.

5. Connect hoses with an inside diameter of 19 mm to the drain and the vent at the top of the head tank to drain the sample to a drain pipe.

6. To the drain at the bottom of the simple head tank, connect a rigid PVC tube corresponding to nominal size 20A (26.2 mm ID) to drain the sample to a drain pipe.

7. To the sample outlet of the detector, connect the drain for controlling the flow rate.



2.2.3 System Using a Pressurized Head Tank (/D1)In a system using an open head tank, air bubbles may form from air dissolved in a sample under the reduced pressure in piping and enter into the detector, resulting in an incorrect measurement. For low turbid waters where the effect of air bubbles is a concern, install a pressurized head tank to prevent pressure changes in the piping from the head tank to the detector outlet and thus prevent air bubbles from occurring in the pipe.

CAUTIONSample conditions and ambient temperature must meet the specifications: maximum pressure: 500 kPa; sample temperature: 0 to 50°C; ambient temperature: -5 to 55°C. Any failure to meet the specifications may damage the detector or other instruments.When the sample pressure is reduced by using a pressure regulator or by other means, air bubbles may form in the piping. In that case, consider the use of an open head tank.

An optional pressurized head tank for low turbidity measurement (option code “/D1”), shown in Figure 2.24, is available from Yokogawa.

15140110

5015

14535

Drainø8/ø6 PE tube coupling

Drain plug

Sample water outlet (to detector)ø8/ø6 PE tube coupling

Needle valve(Material: SUS316)

Pressure gauge(Range: 0 to 500 kPa)

Sample water inletø8/ø6 PE tube coupling

Appr

ox. 3

32Ap

prox

. 127

4-ø6.2 holes

Unit: mm

Figure 2.24 Pressurized Head Tank for Low Turbidity



The piping diagram of a system including the pressurized head tank is shown in Figure 2.24.

h

F3-33E.ai

SampleInlet Drain Port

SampleOutlet

Detector

Drain Valve

Sample

Tap Water

SampleValve


SampleSupply Valve


Drain

Drain

Drain

Sample

PressurizedHead Tank

Zero Water

Bypass Valve Flow Control ValveSampleEffluent



Pressure Gauge



This piping is for introducing a sample into the measurement cell of the detector. Install a pressurized head tank (for low turbidity), valves and pipes by referring to the diagram in Figure 2.24.1. For the piping from a sampling point to a sample valve, use a hose/tube with sufficient

diameter that provides adequate flow of sample in order to prevent clogging. The hose/tube also should withstand the sample pressure. The specified sample pressure when using a pressurized head tank is in the range of 20 to 500 kPa. One example is a rigid PVC tube with nominal size of 16 (22 mm OD).

2. For the piping between the valve and the pressurized head tank, use a 8 mm OD x 6 mm ID polyethylene tube and the corresponding fitting.


4. For the piping between the Pressurized Head Tank and the Detector, connect a valve to one end of the 3-way tee fitting and connect a 8 mm OD x 6 mm ID polyethylene tube and the corresponding fitting between the valve and the pressurized head tank.

5. To the fitting on the bypass valve (needle valve) at the top of the pressurized head tank, connect a 8 mm OD x 6 mm ID polyethylene tube.

6. To prevent clogging or stagnation of air bubbles in the pipe line, install the pipes so that no bends or stagnation occurs.




This piping is for draining a sample form the measurement cell of the detector during measurement. As shown in the piping diagram in Figure 2.24, connect a needle valve to the sample outlet of the detector. By adjusting the opening of this valve and the bypass valve (needle valve) at the top of the pressurized head tank, the pressure change is controlled in the piping between the head tank and the detector outlet, and thus the generation of air bubbles is prevented.1. To the sample outlet of the detector, connect a fitting, such as an elbow fitting,

corresponding to the connection size (Rc1/2 or 1/2 NPT female) and a needle valve.2. To the outlet of the needle valve, connect a 8 mm OD x 6 mm ID polyethylene tube using the

corresponding fitting to drain the sample to a drain pipe.3. As shown in Figure 2.24, the sample from the detector should be discharged to the

atmosphere at a point higher than the measurement cell of the detector. If not, a siphon may be created and the measurement cell may not be filled with a sample. In addition, if the sample inflow stops, the sample will be drawn off and the measurement cell will be emptied, which can cause damage to the ultrasonic transducer, if used.

(3) Drain Piping

This piping is for draining a sample from the measurement cell of the detector and a head tank during cleaning, calibration, or other maintenance.1. The drain of the detector is Rc1/2 (or 1/2 NPT female) thread. Install a fitting corresponding

to the thread and connect a hose/tube with sufficient diameter that provides adequate flow of sample, to route the sample from the detector to a drain pipe. Install the pipe so that no stagnation occurs.

2. As shown in Figure 2.24, install pipe so that the sample can be drained from the head tank to the drain pipe.


This piping is for introducing tap water to a zero turbidity filter and then to the detector for zero calibration or measurement cell cleaning.1. As shown in Figure 2.24, install a tap water valve and a zero water drain valve.2. Connect a zero water supply valve to one end of the 3-waytee fitting attached to the sample


an hose/tube that can withstand the pressure of tap water, such as a rigid PVC tube. The flow rate of zero water supply should be in the range of 1 to 3 L/min.





2.2.4 System without a Head TankThis is a simple system where a sample is taken from the process and directly introduced into the detector. This system configuration can be used when a sample contains a negligible amount of air bubbles or when the turbidity of a sample is high and the effect of air bubbles is nonsignificant. By installing a throttle at the detector outlet side, it is possible to prevent pressure change and thus air bubbles from occurring in the piping from a sampling point to the detector outlet.

CAUTIONSample conditions and ambient temperature must meet the specifications: maximum pressure: 500 kPa; sample temperature: 0 to 50°C; ambient temperature: -5 to 55°C. Any failure to meet the specifications may damage the detector or other instruments.When the sample pressure is reduced by using a pressure regulator or by other means, air bubbles may form in the piping. In that case, consider the use of an open head tank.

The piping diagram of a system without a head tank is shown in Figure 2.25.

h

F3-34E.ai

Sample WaterInlet Drain Port

SampleOutlet

TB820DDetector

Drain Valve

Sample

Tap Water

SampleValve


Sample Supply Valve


Drain

Drain

Sample

Zero Water

Flow Control ValveSample Effluent



Process Piping

Figure 2.25 Piping Diagram


This piping is for introducing a sample into the measurement cell of the detector. Install valves and pipes by referring to the diagram in Figure 2.25.1. For the piping from a sampling point to the sample valve in the sample line to the detector,

use a hose/tube with sufficient diameter that provides adequate flow of sample to prevent clogging. The hose/tube also should withstand the sample pressure. One example is a rigid PVC tube with nominal size of 16 (22 mm OD).

2. To the sample inlet of the detector, connect a 3-way (tee) or appropriate fitting corresponding to the inlet’s connection size (Rc1/2 or 1/2 NPT). This allows switching of the sample flow and the zero water flow.

3. For the piping between the sample and the detector, connect a supply valve to one end of the 3-way tee fitting and connect a hose/tube that can withstand the flow and the pressure of a sample between two valves using fittings corresponding to the connection sizes of each valve.



4. To prevent clogging or stagnation of air bubbles in the pipe line, install the pipes so that no bends or stagnation occurs.


This piping is for draining a sample from the measurement cell of the detector during measurement. As shown in Figure 2.25, connect a needle valve to the sample outlet of the detector. By adjusting the opening of this needle valve, the pressure change in the piping between the sampling point and the detector outlet is controlled, and thus the generation of air bubbles is prevented.1. To the sample outlet of the detector, connect a fitting, such as an elbow fitting,

corresponding to the connection size (Rc1/2 or 1/2 NPT female) and a needle valve.2. To the outlet of the needle valve, connect a fitting corresponding to the valve connection size

and a hose/tube that can withstand the flow and the pressure of a sample. Route this hose/tube to a drain pipe.

3. As shown in Figure 2.25, the sample from the detector should be discharged to the atmosphere at a point higher than the measurement cell of the detector. If no, a siphon may be created and the measurement cell may not be filled with a sample. In addition, if the sample inflow stops, the sample will be drawn off and the measurement cell will be emptied, which can cause damage to the ultrasonic transducer, if used.

(3) Drain Piping

This piping is for draining a sample from the measurement cell of the detector during cleaning, calibration, or other maintenance.1. The drain of the detector is Rc1/2 (or 1/2 NPT female) thread. Install a fitting corresponding

to the thread and connect a hose/tube with sufficient diameter that provides adequate flow of sample, to route the sample from the detector to a drain pipe. Take care to install the pipe so that no stagnation occurs.

2. As shown in Figure 2.25, install a pipe so that the sample drained from the detector to the drain pipe.


This piping is for introducing tap water passed through a zero turbidity filter, to the detector for zero calibration or measurement cell cleaning.1. As shown in Figure 2.25, install a tap water valve and a zero water drain valve.2. Connect a zero water supply valve to one end of the 3-way tee fitting attached to the sample


an hose/tube that can withstand the pressure of tap water, such as a rigid PVC tube. The flow rate of zero water supply should be in the range of 1 to 3 L/min.



<3. PREPARATION for OPERATION> 3-1


3. PREPARATION for OPERATIONn Operation mode

Two types as follows are available.

l Measurement modeSteady-state operation takes place.

l Maintenance modePerform maintenance in this mode. Be sure to turn to this mode before starting calibration or maintenance.To switch to Maintenance mode, Main screen > Maintenance mode OFF > ON(or Sensor menu > Maintenance > Maintenance mode)

n Operation in Maintenance modeItem Operation

Measurement Maint. damping time constant appliesmA output Hold or output by following the automatic hold setting.

Converter menu > Converter setting> mA output setting >Output channels > Auto hold setting

Contact output When maintenance is setup, the contact is On.Other contact outputs remain the previous value gained rightbefore the Maintenance turned on.

Manualoperation

Solenoid manual operation is enabled.Sensor menu > Maintenance > Valve. PumpTo initialize Valve, turn off the maintenance mode.

Auto wash Autocalibration

not available

3.1 Piping and Wiring CheckConfirm that the piping and wiring have been completed correctly before supplying water or power.Refer to the chapter 2 for Installation and piping.

3.2 Confirming detector conditionEnsure that the drain cock is firmly closed. Open the front cover and set a new desiccant. Close the cover firmly.

3.3 Supplying Power and switching operation modeConfirm that the piping and wiring are made correctly. Turn on the power supply then the detector starts up in a measurement mode. Keep On the Maintenance Mode until the preparation for the operation completes. Turn on on Main screen of the converter to go to Maintenance mode.when the “-U1” (Oscillator for ultrasonic cleaning) is selected, the ultrasonic cleaning is ON when the instrument starts up. Keep the ultrasonic OFF until a sample is introduced.

Sensor menu > Maintenance > Ultrasonic On/Off

<3. PREPARATION for OPERATION>3-2


3.4 Filling zero water and Test operationSupply zero water to the flow cell. When a zero filter is used, first run tap water through the filter to remove the air inside. After the air is removed enough, keep running the water for more than one hour.

3.5 Setting Operation ParametersTB820D is preset with defaults prior to factory shipment.Before measurement, verify that these factory default settings meet the operating conditions. If necessary, reconfigure parameters to enable the expected operations. For details of setting data, refer to “4. SETTING PARAMETERS” and “5. FLXA402T sensor menu”.When user changes the operation parameter, note down the changed data. Set the appropriate parameters to suit your operation conditions. 1: Display/Output setting on the converter See FLXA402T Operation of Converter IM 12A01G01-03EN 2: Setting detector unit parameter. See “4. SETTING PARAMETERS”. 3: Setting Auto wash/Auto calibration Configure sequence operation by setting up the converter. see “4.5 Auto Wash/

Calibration setting”

3.6 CalibrationOperate TB820D for about one hour before calibration. Refer to “7. CALIBRATION” for calibration requirements.


<3. PREPARATION for OPERATION> 3-3


3.7 Supplying a Sample and Adjusting the Flow Rate

Supply a sample to the detector and adjust its flow rate.

System Using an Open Head Tank (Option code /D3) (See Piping Diagram in Figure 2.20)

(1) Open the sample valve to supply a sample to the head tank.(2) Completely open the sample supply valve to allow the sample to flow into the detector.(3) Check that the sample is drained from the detector drain. Then, close the drain valve.(4) Adjust the opening of the valve at the sample out of the detector so that the sample

overflows and is surely drained from the head tank.(5) Measure the drainage volume at the sample outlet of the detector using a beaker or relevant

measure. The rate of flow to the detector must be in the range of 1 to 10 L/min.

System Using a Simple Head Tank (Option code /D2) (See Piping Diagram in Figure 2.22)

(1) With the outlet valve after the detector open completely, open the valve at the inlet of the simple head tank gradually and completely.

(2) By gradually closing the valve at the sample out of the detector, adjust the flow rate so the sample is thoroughly drained from the drain of the simple head tank.

(3) Close the sample supply valve while checking the turbidity reading until the influence of air bubbles disappears. Check that the sample is overflowing from the drain of the simple head tank.

System Using a Pressurized Head Tank (Option code /D1) (See Piping Diagram in Figure 2.24)

(1) Completely open the bypass valve at the top of the head tank, the sample supply valve, and the needle valve at the sample outlet of the detector.

(2) Open the sample valve to supply a sample to the head tank.(3) Gradually close the bypass valve at the top of the head tank until the rate of flow from the

sample outlet of the detector is in the range of 0.05 to 10 L/min. The rate of drainage from the bypass valve should be secured to the extent that air bubbles are removed.

(4) Pressure changes in the line between the sampling point and the detector outlet should be controlled to prevent air bubbles from occurring. For this, gradually close the valve at the sample outlet of the detector until the pressure gauge at the tops of the pressurized head tank approximates the pressure of the sample and until the rate of flow from the sample outlet of the detector is in the range of 0.05 to 10 L/min. Check the pressure gauge at the top of the pressurized head tank. The gauge must read under 500 kPa.

System without a Head Tank (See Flow Diagram in Figure 2.25)

(1) With the valve at the sample outlet of the detector opened completely, open the sample valve (immediately after the sampling point) in the sample line.

(2) Open the sample supply valve to supply a sample to the detector.(3) Adjust the opening of the valve at the sample out of the detector until the rate of flow from

the sample outlet of the detector is in the range of 0.05 to 20 L/min.(4) Pressure changes in the line between the sampling point and the detector outlet should be

controlled to prevent air bubbles from occurring. For this, gradually close the valve at the sample outlet of the detector until the rate of flow from the sample outlet of the detector is in the range of 0.05 to 20 L/min. Before taking this procedure, make sure that the sample pressure of the process is under 500 kPa.

<3. PREPARATION for OPERATION>3-4


3.8 Adjusting ultrasonic powerWhen “-U1” for the Oscillator for ultrasonic cleaning is specified, adjust the ultrasonic power. Be sure to fill the flow cell with a sample when adjusting the ultrasonic power. First, turn on the ultrasonic power from the maintenance menu of FLXA402T. Then, perform the adjustment of the PG400 pulse generator for a clean unit. (1) Open the PG400 cover and check the output switch. If it is OFF, turn it ON. (2) Confirm that the green POWER LED and red OUTPUT LED are lit on. (3) Adjust the oscillator output so that it does not affect the turbidity readings. Adjust the

output volume of the PG400 so that the cavitation effect of ultrasonic cleaning affects the turbidity indication within 1% of the output range (full scale) used. The volume of the output range is set to the middle at the factory setting. For details on the adjustment method, see the PG400 user’s manual IM 19C01B05-01EN.

3.9 Switching to measurement modeAfter supplying the sample and adjusting its flow rate, activate all the instruments in the loop configuration, such as ultrasonic cleaning equipment. When it is ready to operate, switch off the maintenance mode to shift to the measurement mode. Make sure no error message appears.

https://web-material3.yokogawa.com/IM19C01B05-01EN.pdf

https://web-material3.yokogawa.com/IM19C01B05-01EN.pdf

<4. SETTING PARAMETERS> 4-1


4. SETTING PARAMETERSThis chapter describes all Sensor setting and Auto wash/Cal setting as a part of converter menu.About other setting parameters of the converter menu, read FLXA402T Operation of Converter.To go to Sensor setting menu, refer to 5.5 Setting. To go to the converter menu, refer to FLXA402T Operation of Converter IM 12A01G01-03EN.

Table 4.1 Sensor setting

Menu Parameter Default ReferenceMeasure setting Negative value non output Disable 4.1.1

Turbidity unit select mg/L 4.1.2User-defined unitMeas. damping time constant 20.0 sec 4.1.3Turbidity warning High limit 9999 (*1) 4.1.4Turbidity warning Low limit -10.0 (*1)

Air denoising setting

Air denoising function Disable 4.1.5

Air noise detection value 999.9 (*1)Air denoising hold time 30 secDenoising release time 30 sec

Cal./Maint. settings Turbidity value of check tool 90.0 (*1) 4.2.1Maint. damping time constant 6 sec 4.1.3Zero shift value 0.0 4.2.2Correction factor 1.0Stability check allowable width *2 4.2.3Stability checking time 10 secStability check limit time 1.0 minWash/Cal. box Disable 4.2.4Ultrasonic wash Disable 4.2.5

Calibration setting others

Zero *2 4.2.6

Slope 100.0%Sens.factor *2

Linearize table

point 1. X value *2Y value *2







<4. SETTING PARAMETERS>4-2


Menu Parameter Default ReferenceDiagnosis setting Light source diagnosis Enable 4.3.1

Dried condition diagnosis EnableLight source operating days EnableWiper operating days Enable

Communication setting

Sensor connection address 1 4.4

*1 Depend on the configured unit of turbidity*2 Value is preset factory default.After initialization, set each value to default.

Table 4.2 Converter setting

Menu Parameter Default Reference NoteAuto wash/cal. settings

Auto sequence for wash/cal. Disable 4.5.1

First start Year YY [year] 4.5.2 Specify the last two digitsof the year (20xx)

First start Month MM 1[month]First start date DD 1 [days]First start hour hh 0 [h]First start minute mm 0 [min]

Auto update of start date DisableTBsetting

Auto wash function Enable 4.5.3

Wash type Water flowAuto calibration function DisableWashing interval 6.0 hour 4.5.2Repeat count of wash 1 TimesCalibration frequency 0 Times 4.5.4Drainage time 20 secWashing time 65 secWiper driving time 10 secFlow waiting time 50 secRecovery time 150 sec



4.1 Measure setting4.1.1 Negative value non output

Select whether to display and output negative value or fix the value as “0” when the measurement results negative.

4.1.2 Turbidity unit selectSelect turbidity unit, mg/L, TU, NTU, FTU, FNU, or user defined unit. If you select a user defined unit, the unit is displayed in text.

4.1.3 Meas. damping time constant, Maint. damping time constant

Processing damping time constant smooths the fluctuation of measured turbidity. The 63% Response time is set as a damping time constant. The larger the time constant the more stable the value of turbidity becomes, but the slower the response is. In a measurement mode, the measurement damping time constant is applied. Maintenance damping time constant is used under the following period: Maintenance mode During Calibration Auto wash/calibrationTo make the response faster under the above period, set the maintenance damping time constant to a smaller value than the measurement damping time constant.

4.1.4 Turbidity warning High/Low limitSet the High or Low limit of the turbidity value. If the value exceeds the limit, a warning appears.

4.1.5 Air denoising setting[When the Air denoising function is Needed]

Air bubbles or dust in a sample may cause fluctuation in turbidity readings; generally a sudden rise in reading occurs. The fluctuation is dependent on the size of air bubbles or dust and their behavior.It is recommended that a head tank for removing air bubbles be installed. A head tank is for removing air bubbles and thus for preventing them from reaching the detector. In rare cases, however, air bubbles occur and grow in the pipe between the head tank and the detector, and rise to the measuring cell, resulting in reading fluctuation.The air denoising function is to detect and suppress a sudden change due to air bubbles or dust.



[How It Functions]

To suppress a sudden fluctuation due to air bubbles or dust, the TB820D:(1) checks a turbidity signal before averaging;(2) calculates the difference between the current signal and the previous signal;(3) compares the difference with the Air noise detection value;(4) if it is less than the Air noise detection value, proceeds to averaging and gives the turbidity

reading;(5) if it is greater than the Air noise detection value, holds the output for a specified Air denoising

hold time period;(6) during that period, suspends the Air noise detection value check. If the value returns to the original value in a short time, it is judged as a bubble and the value

is held for the Air denoising hold time. If the value remains changed for a certain period of time, it is judged that the measured

value has changed, not a bubble, and the hold is released.(7) averages signals without the Air noise detection value check for a specified Denoising

release time period and gives turbidity readings; (8) after the Denoising release time has elapsed, performs the Air noise detection value check

again.[Instructions for Use]

The air denoising function is effective in processes where turbidity changes are relatively small under normal conditions, but it may not be suitable for processes where sudden changes occur often. Even if sudden changes do not usually occur, this function may be activated and may cause a delay in the response of the reading or output if stepwise turbidity changes occur occasionally. Therefore, before using this function carefully consider the process conditions, and in order to use it properly, determine optimum setpoints for the operating conditions while changing them little by little.When using the function, pay attention to the following.(1) Adjust the Air noise detection value according to the degree of reading change due to air

bubbles or dust.(2) If an excessively long Air denoising hold time is set, the turbidimeter may not be able to

detect a change in reading that may have occurred and should have been recognized as a real change.

(3) If the function is responsible for the delay in the response of the turbidity reading, try setting the Denoising release time longer without changing the Air denoising hold time.

(4) When an abnormal turbidity reading is suspected, turn off the function once and wait for a while and see. The function may have prevented the turbidimeter from giving readings properly.



F6-12E.ai

Time

Turbidity

Air denoising hold timeDenoising release

time

In Process

A > Air noise detection value

A: Difference between the current signal and the previous signal

A < Air noise detection value

Turbidity Signal Intake Cycle

Function restarts

Air Bubbles Detected

(No turbidity signal is taken during the process)

Figure 4.1 Air denoising function

[How to Set Each Parameter]

a. Air noise detection valueAir noise detection value is used to determine whether a reading is a spike due to air bubbles or dust and is defined as a turbidity value in NTU. (The ratio of the sensitivity correction factor is also calculated automatically.)For the Air noise detection value check, a pre-averaging turbidity value is used. To determine the Air noise detection value, it may be needed to know the degree of fluctuation in pre-averaging turbidity signals. Set the damping time constant to 0 to give turbidity readings directly without averaging. Check readings to know the degree of fluctuation. Generally, the Air noise detection value is set to a value greater than the fluctuation.b. Air denoising hold timeWhen a signal exceeds the air noise detection value, the turbidity value is held for a specified Air denoising hold time. The Air denoising hold time should be long enough for removing air bubbles and dust in the flow cell. Normally, air bubbles and dust will run off the flow cell or disappear within a short time (in a few seconds). In practice, first set the Air denoising hold time to a shorter time, and then increase it if the function does not work satisfactorily.c. Denoising release timeAfter the Air denoising hold time has elapsed, the turbidimeter gives readings without any processing for a specified Denoising release time to verify that no fluctuation occurs in turbidity readings. The time count begins after the Air denoising hold time. It is unlikely that air bubbles or dust occur consecutively. Therefore, the Denoising release time may not need to be too short. If the Denoising release time is set too short, the response is delayed when a sudden change in turbidity actually occurs. First set the Denoising release time slightly longer. If something is wrong with the behavior, shorten the time.Instructions for Use

Be careful when using the function since the following restrictions apply.(1) The function works only in measurement mode. As soon as the mode is changed, the Hold

or Denoising release timer is reset and the function stops.(2) During an Air denoising hold time period, both turbidity readings (including communication

data) and analog outputs are held. During the hold time, is displayed on the HMI. Contact output doesn’t work by this function.

(3) The function does not run for approximately 5 seconds right after the turbidimeter is turned on.

(4) If the turbidimeter is turned off then on again while the function is running, the timer is reset.



4.2 Cal./Maint. Settings4.2.1 Turbidity value of check tool

Displays the value on the turbidity check tool to measure the slope. The value is set at the factory.

4.2.2 Zero shift value, Correction factorThese parameters are related to zero shift correction and sensitivity correction in the calibration menu. Normally zero shift value is 0, and correction factor is 1. See chapter 7. Calibration.

4.2.3 Stability checkYou can configure the following parameters to evaluate the measurement stability in a calibration.

● Stability check allowable width● Stability checking time● Stability checking time

The measurement stability is verified, when the measurement stays within the range of “Stability check allowable width” without exceeding the range for longer than the set period of” Stability checking time”.If the measurement does not become stable before “Stability check limit time” is up, a confirmation dialog appears to abort the calibration.

l Stability check allowable widthSet the range over which the stability of a measured value is checked. If variations of a measured value over the stabilization time are within this setpoint, the measured value is judged to have stabilized.

l Stability checking timeDuring calibration, the stability of the measured value is constantly monitored. If variations of a measured value over the stabilization time are within the Stability check allowable width set above, the measured value is judged to have stabilized.

l Stability check limit timeIf the measured value does not become stable during the period of Stability check limit time, the calibration is cancelled.

4.2.4 Wash/Cal. boxSelect whether or not to use Wash Box (Relay box for solenoid valve). While using Relay box, make Wash box Enabled.If Wash Box is disabled, you cannot implement Auto wash/calibration.If you enable this function when Wash Box is not connected, an alarm occurs to notice Wash Box error.

4.2.5 Ultrasonic washSelect Ultrasonic wash On/Off. When this function is On, you can switch Ultrasonic wash On/Off on Maintenance menu. If you need to stop temporarily, turn it Off on the Maintenance menu.



4.2.6 Calibration setting othersZero, slope, Sens.factor is changed manually.Do not change those setting except for resetting value. Go to sensor detail screen to check the setting as reference.

4.3 Diagnosis setting4.3.1 Light source diagnosis

Select Light source diagnosis On/Off. See 5.3 for details.

4.3.2 Dried condition diagnosisSelect Dried condition diagnosis On/Off. See 5.3 for details.

4.3.3 Operating daysSet each counts of parameter enabled/disabled. If you want to confirm the value of operation days, enable the function. However, even if you set it disabled, the operating day counts internally. See 5.3 for details.

4.4 Communication settingn Sensor connection address

You can change Modbus address. After changing Modbus address, you need to change the configuration of the converter that connects to the system.To change the converter setting, Converter menu > Setting > Converter setting > Advanced settings > MODBUS setting >

Sensor Address setting (S)See FLXA402T Operation of Converter IM 12A01F01-03EN




4.5 Auto Wash/Calibration setting4.5.1 Auto sequence for wash/cal.

Enable this function to use Auto wash/calibration. If this function is disabled, Auto wash/calibration is never implemented even if other setting is active.

4.5.2 Start dateAs the first time Auto wash/calibration, enter a future date/time but not the current one.If you want to perform the next and subsequent Auto wash/calibration automatically, turn ON Auto update of start date. The next date of Auto wash/calibration is determined according to washing interval.

4.5.3 Auto Wash/Calibration function and wash typeYou can set Auto wash function and Auto calibration function respectively to Enable/Disable. When you use Auto calibration, always set Auto wash to Enable. Always select water flow as wash type.

4.5.4 Auto sequence settingConfigure the following parameters to setup the schedule for Auto wash and Auto calibration.

● Washing interval● Repeat count of wash● Calibration frequency

The auto-sequence starts at the setup hour of the start time at the washing interval cycle. Set how many times the auto wash repeats in a sequence by setting “Repeat count of wash”.When Auto calibration function” is ON, Auto sequence starts at an interval determined at Calibration frequency. When Auto wash ends, Auto calibration operates one time.When Calibration frequency is set to “0”, no Auto calibration operates.The next figure shows the example when: Repeat count of wash is 2. Calibration frequency is 3.

Automatic calibration takes place one time after the auto sequence repeats as many asCalibration frequency.

start date and time

Next sequencestart

Next sequencestart

Time schedule

Washing interval

Repeat count of wash

Washing interval

Repeat count of wash

Washing interval

Repeat count of washWash Wash Wash Wash Wash Wash Cal Wash Wash

Other parameters are for setting details about one count of Auto wash/Auto calibration. For further information on the auto sequence, read Appendix.

<5. FLXA402T sensor menu> 5-1


5. FLXA402T sensor menuStart up> Main screen

Maintenance mode ON/OFF

to Converter menu

Icon appears here to show the status.Nothing appears at a measurement mode

Measurement value

to Calibration menuto Sensor menu

On Main screen the shortcut menus Maintenance mode dialog

To go to Sensor menu,Start up> Main screen > Sensor menu The following operation are available. Auto wash Calibration (sensor calibration) Setting (sensor setting) Sensor maintenance etc.

5.1 5.2 5.3

5.5 5.65.4

Figure 5.2 Sensor menu


3rd Edition : Oct. 14 , 2021-00IM 12E01B30-02EN

5.1 WASHOn Sensor menu, tap > a dialog to start automatic washing manually Tap “Start” then Auto Wash. runs only one time. This operation does not affect any automatic sequence schedule.

When you have a password, a password verification appears. Upon successful confirmation, Wash screen appears.For further information on the password setting, see FLXA402T Operation of Converter IM 12A01G01-03EN 5.4 Password.

5.2 CalibrationOn Sensor menu, tap “Calibration” > Calibration menuOr on Main screen, tap “Calibration” > Calibration menuFor further information about Calibration, see “4. SETTING PARAMETERS”

When you have a password, a password verification appears. Upon successful confirmation, Calibration screen appears.For further information on the password setting, see FLXA402T Operation of Converter IM 12A01G01-03EN 5.4 Password.

5.3 DetailOn Sensor menu, tap “Detail” > to check details (setup, sensor diagnosis, calibration, and module production number).In case of trouble, when you contact Yokogawa service, please inform us of the module and FLXA402T software revision displayed on the Detail under converter menu and sensor menu and module production number, style number indicated on the nameplate attached to the instrument







Figure 5.2 Sensor menu flow chart

n Measurement value

l TurbidityShows the turbidity on Main screen.

l Current valueShows input current value of Transmitted, Scattered light, Light source.TB820D does not support “Transmitted”, which displays “----”.



l Zero, Slope, Corr. factor, Zero shift valueIt is recommended that you note the values of these items prior to performing calibration. When calibration is executed, the data is overwritten.

l Lightening IFShows a driving current value of the light source.

n Sensor wellness

l Light source diagnosisThe result shows how much the Light source condition has changed since the factory preset. The more n appears in each gauge, the more sound the Light source is. A gauge is indicated only when the setting of Sensor wellness for Light source is enabled. If the sensor wellness setting is “disabled, a bar (----) is displayed.

l Dried condition diagnosisShows the dryness inside the detection unit.The next table shows some temperature ranges at which condensation may possibly form on the window glass.

■ Water temperature above 10°C■ above 5°C to 10°C or below■ ■ 3°C or above to 5°C or below■ ■ ■ above 0°C to 5°C or below■ ■ ■ ■ 0°C or below

If the Dried condition diagnosis is “disabled, a bar (----) is displayed.

l Replacement/Operating daysManages desiccant replacement day or operating days of Light source and wiper. To reset each data, go to dialog of Sensor wellness reset. Press reset, then the number of operating days is reset to 0 but the replacement date is updated.Only when the wellness setting is enabled, the result is displayed.

n Predict. maintenance

l Last calibrated atDisplays a date when the last auto calibration took place and the last calibration menu was implemented.

l Next sequence startWhen next auto wash, next auto calibration are scheduled, the next date on schedule is displayed. If you set a date/time for the first-time operation, the date and time for the first time operation is displayed. When you set Next auto calibration date to be updated automatically, the next date of auto calibration date is automatically updated.



n TB detectorDisplays Serial number (Serial No.) of a connected Turbidity detection unit, software version (Software Rev.), Model code (Model code), internal serial number of CPT board, LED board and analog board (Internal SN.(CPT), Internal SN.(LED), Internal SN.(Analog) ).

n Converter log, Sensor logSame display as on the converter “Detail”. See FLXA402T Operation of Converter IM 12A01G01-03EN

5.4 Reset op. timeTo reset wellness data of each sensor Sensor menu > Reset op. time > Sensor wellness , tap “Reset data” > Reset data

You can reset each data from the dialog of Sensor wellness. If you reset, the operating days are reset to “0” but the replacement date is updated.When you have a password, the password verification appears. Upon successful confirmation, Reset confirmation screen appears.For further information on the password setting, see FLXA402T Operation of Converter IM 12A01G01-03EN 5.4 Password.

5.5 SettingSensor menu > Setting .

When you have a password, the password verification appears. Upon successful confirmation, Sensor Setting screen appears.For further information on the password setting, see FLXA402T Operation of Converter IM 12A01G01-03EN 5.4 Password.If you go to Sensor setting, the mA output becomes HOLD when automatic hold function is enabled, and contact output keeps the current status.








n Sensor settingSet sensors. See 4.1 for the setting.

n InitializationInitialize sensor parameters.In the box of File name, name of defined sensor config. file to load is displayed, after sensors connected are automatically detected. You cannot change the file name.If you tap “Execute”, the loading starts. When the loading ends, you will return to Sensor menu.Confirm the items before tapping Execute. If you initialize the calibration value of Zero, Sens. factor, linearize table etc., they return to the factory default.

5.6 MaintenanceSensor menu > Maintenance

When you have a password, the password verification appears. Upon successful confirmation, Maintenance screen appears.For further information on the password setting, see FLXA402T Operation of Converter IM 12A01G01-03EN 5.4 Password.

n Maintenance modeSwitches the mode between the measurement and the maintenance. For Maintenance mode, See 3. Preparation for Operation.

n Light source On/OffSwitches On/Off Light source. This function is enabled only when Maintenance mode is On.

n SV/Wiper operationControls the solenoid valve connected to Relay box. This function is enabled only when Maintenance mode is On.

n Ultrasonic On/OffSwitches On/Off Ultrasonic cleaning, but only when the Ultrasonic cleaning function is enabled. Even when the maintenance mode is off, this operation is available.



<6. OPERATION> 6-1


6. OPERATIONThe TB820D does not normally require any manual operations except when periodic cleaning/calibration is performed or when a failure occurs.

6.1 Turbidity measurementWhen Power Supply is turned ON, the turbidity detector is activated in a measurement mode. Turbidity of sample is continuously measured. If ultrasonic cleaning is available, ultrasonic is turned on when power supply is turned on.

6.2 Air denoisingIf air denoising function is set enable, measurement value of detector is hold while air noise is detected. “Check” status icon appears on main screen during air denoising hold time. Contact output doesn’t work by this function.

6.3 When Sample Water Supply is Cut OffThe turbidity measurement is not affected by temporary suspension of sample water supply, but long-term suspension may interfere with the accuracy of the instrument. Since the TB820D cannot detect whether the sample water supply is stopped or not, periodical check of the sample line is needed.

6.4 Automatic wash/Automatic calibration Operation

When the sampling system is correctly installed, and Automatic wash/Automatic calibration is properly setup on the converter setting, Automatic wash/Automatic calibration starts at a scheduled time during a regular operation in a measurement mode. For the details about the schedule, see 4.5 Auto wash/calibration setting.You can check when the next auto sequence starts on the sensor detail screen. If the scheduled auto sequence date has already passed, Auto wash/Auto calibration does not operate.For details about the converter displays or mA displays during Automatic wash/Automatic calibration operation, see FLXA402T Operation of Converter IM 12A01G01-03EN. During Automatic wash/Automatic calibration, you cannot turn on the maintenance mode. You cannot enter the calibration menu or the setting menu, either.

6.5 Stop and restarting operationTo stop an operation, stop supplying power. If the instrument will be out of operation for a long period, stop supplying sample and wash the Flow cell and keep it empty or keep zero water running. When restarting operation, perform necessary inspection and maintenance referring to the chapter 8. Maintenance.


Blank Page

< 7. Calibration > 7-1


7. CALIBRATIONThis chapter describes types of calibration enabled with TB820D. Periodical calibration and an optimization of calibration parameters for Zero or Slope ensure accurate measurement. Zero shift or the sensitivity correction can also correct the standard and grab sample sensitivity. Clean the Flow cell before calibration. Perform calibration with the detectors or the Flow cells free from contamination when the reading is stable.<How to pour samples into the Flow cell>

● Use a funnel to pour the sample into the Flow cell. Pour it in the funnel.● After pouring the sample into the Flow cell, drain the sample once. Pour another sample

again and measure the second sample.● Do not allow bubbles to enter the sample. Pour the sample slowly down the side of the

funnel to help it free from bubbles as below.● Do not allow the tip of the funnel to touch the sample in the cell to avoid any contamination

adhered to the surface of the funnel as below.

F7-10E.ai

Figure 7.1

< 7. Calibration >7-2


7.1 Turbidity calculation and calibration menuZero, Slope are adjusted based on a standard solution as a reference. (Equation 7.1) If the turbidity measured by the instrument may differ from the one measured manually in a lab due to the difference of properties of the water sample and of turbidity measurement methods, the instrument can be adjusted so that it reads the same value as the one measured in a lab by performing the zero shift correction or sensitivity correction.In this case, the instrument determines zero and sensitivity correction factors in addition to the calibration factor determined based on the calibration using standards. (See Equation 6.2.)

T1=[100/SL/S0 ]*[V-A]......... Equation 7.1T2 = K*T1 + B .....................Equation 7.2Where:

T1: Turbidity based on turbidity standardsS0: Sensitivity factor Calculated reference sensitivity calibration. This calibration is performed at the factory

before shipment.SL: Slope Calibrated by slope calibration. SL(%) value means how different sensitivity is from

factory sensitivity.A: Zero Calculated in zero calibration using zero water.V: Measuring signal This signal is calculated by ratio of scattered light current and light source monitoring

current.T2: Turbidity after zero and sensitivity correctionsK: Correction factor Determined in sensitivity corrections or 2-point sensitivity corrections.B: Zero shift value Determined in zero shift corrections or 2-point sensitivity corrections.

l Turbidity manual calibrationZero calibration (7.3) Adjust the reading to zero point. Update the Zero of calibration parameter.(A in Equation

7.1) ZeroSlope calibration (Check tool) (7.4) Update the Slope of calibration parameter (SL in Equation 7.1) by using Check tool.

Adjust the reading to pre-defined turbidity value of Check tool. Be sure to perform after Zero calibration.

Slope calibration (Standard solution) (7.5) Adjust the reading to arbitrary concentration value.

Update the Slope of calibration parameter (SL in Equation 7.1). Be sure to do this after Zero calibration.

l Turbidity auto calibrationAuto zero calibration (7.6) Zero calibration by feeding Zero water automatically.

Enable only when the converter setting of Auto Wash/Auto Calibration is correct and the sampling system runs normally.



l Calibration othersZero shift correction (7.7) Update the Zero correction factor (B in Equation 7.2) using Zero water. Sensitivity correction (7.8) Update the basic Sensitivity correction factor (K in Equation 7.2) by correcting to an arbitrary

sample value. Be sure to do this after Zero shift correction.2 Points correction (7.9) Update the Zero correction factor (B in Equation7.2) and Sensitivity correction factor (K in

Equation 7.2) all together, by using samples of two different concentration except for zero.Reference sensitivity calibration (7.10) Update the Reference sensitivity (S0 in Equation 7.1) which is an important parameter for

concentration calculation. Slope is initialized to 100 %. Usually this calibration is performed only prior to factory shipment.

[Calibration status and calibration recovery status]

If you enter calibration’s screen from calibration menu without turning on the maintenance mode, the turbidity meter enters calibration status and enters the maintenance contact and auto hold target status. When calibration is finished or interrupted and the unit returns to the main screen, contact status and mA hold status remain unchanged, and the flashes.

After confirming that the reading is normal, press the flashing to cancel calibration recovery and return to measurement mode. When 1 hour has elapsed with calibration recovery state, the measuring mode is automatically returned.

7.2 Turbidity standardsThe turbidity standards are used as reference for adjusting a zero or span point of a turbidity detector.

n Zero Standard

l Zero Turbidity Standard SolutionFiltered tap water is used as a zero turbidity standard solution for TB820D turbidity detector. For zero calibration, tap water should be filtered in two steps: first through a 1 µm filter and then through a 0.2 µm filter. If the measuring range exceeds 2.0 NTU, tap water filtered only through a 1 µm filter, can be used.

Note: The instrument has been pre-calibrated for zero point using tap water filtered through a 0.2 µm filter as a zero turbidity standard solution at the factory before shipment.

l Zero Turbidity FilterThe specifications of the zero turbidity filter that can be purchased from Yokogawa is as follows.

Item 1 µm Zero Turbidity Filter 0.2 µm Zero Turbidity FilterPart number K9411UA K9726EFPiping connection Rc1/2 Rc1/2Maximum pressure 500 kPa 500 kPaCartridge material Polypropylene PolypropyleneFilter size 1 µm 0.2 µmAccessory Air vent plug Air vent plug



n Turbidity Standards

l Turbidity Standard SolutionA formazin solution is used as a turbidity standard solution for TB820D turbidity detector.

Note: The instrument has been pre-calibrated for span point using a formazin standard solution at the factory before shipment.

l Check ToolA check tool used for span check in regular maintenance, is supplied with the turbidity detector.

Note: The turbidity value indicated on the check tool has been determined for the turbidity detector of interest based on zero and span calibrations at the factory; it is a unique value, specific to the turbidity detector. Be sure to use the check tool supplied with the turbidity detector. Also, special care should be taken when handling a check tool. Scratches or dirt on the surface of a check tool may affect the turbidity value assigned to the block.

NOTEUsing the supplied check tool for span calibration is not approved for US EPA applications. For US EPA applications, perform a 2-point calibration using standard solutions. Use 2 points correction menu (See”7.9 2 points correction”).

How to install the check tool

• Remove the top cover from the top of the detector. Loosen the four screws fixing the clear cover and remove the clear cover.

• Make sure that the flow cell is filled with zero water. Place the check tool in place of the clear cover and fasten it with screws.

Figure 7.2 Check Tool

CAUTIONDo not lose the check tool supplied with the turbidity detector. The check tool has a turbidity value unique to the turbidity detector of interest. Therefore, the same check tool cannot be purchased again. If it is lost, contact Yokogawa. We may provide another check tool prepared in advance.



<How to clean the check tool>

Clean the dust and dirt on the surface of the check tool.(1) Cleaning with the attached silicone cloth or washing If the surface is dusty, use the included silicone cloth to gently wipe it off and remove the

dust. At this time, do not rub hard the surface. If the dust and dirt cannot be removed by just wiping it, wash it with tap water. After cleaning, drain the water well and absorb the remaining water with tissue paper. At this time, do not rub the surface.

(2) Cleaning with detergent Touch the surface with your hands. If your hands still get dirty, or if the stain does not come

off even after cleaning (1), clean it with the included detergent or neutral detergent. Take the following steps below for cleaning.

a. Dissolve an appropriate amount of detergent in tap water and soak the check tool. b. Shake the check tool in the detergent solution to clean the surface. c. If the stain is tough and does not come off by just shaking it, rub gently the surface in the

detergent solution. d. After the stain comes off, rinse off the washing solution with the tap water and drain the

water droplets on the surface. e. Wipe off the residual solution on the surface with tissue paper, but do not rub hard the

surface.

CAUTION• Avoid rubbing hardly regardless of the material of the cloth.• Do not use agents other than mild detergent for wash; avoid ethanol, acetone, and other

solvents.• Do not use fingers to wash off the stain on the surface.• Handle with care. Scratches on the surface may interfere with accurate measurement.

n Formazin Standard Solution

WARNING• The reagents are harmful if inhaled or swallowed.• In case of contact with skin, flush skin with plenty of soap and water. Seek medical advice,

as appropriate, if symptoms appear.• A Class A extinguisher should be provided in work area.• Wear protective goggles, lab coat, and protective gloves to prevent skin contact. Use a vent

hood in the indoor workplace.• For details of the chemical handling, refer to the Material Safety Data Sheets (MSDS).

A turbidity standard calibration solution should be prepared by diluting a 400 NTU formazin standard stock solution. This section describes the procedures for preparing a standard stock solution and a diluted solution for calibration.



n Preparing a Formazin Standard Stock Solution

l Reagents Required• Hydrazine sulfate, (NH2)2·H2SO4• Hexamethylene tetramine, (CH2)6·N4

l Equipment Required• Measuring flask, 2 x 100 ml• Measuring flask, 1000 ml• Volumetric pipette, 50 ml• Analytical balanceNote: Class A volumetric flasks and pipets are required.

l Procedure1. Weigh out 1.000 g ±0.001 g of hydrazine sulfate with a balance, place it in a 100-ml

measuring flask, and add deionized water to make 100 ml (solution A).2. Weigh out 10.00 g ±0.01 g of hexamethylene tetramine with a balance, place it in another

100-ml measuring flask, and add deionized water to make 100 ml (solution B).3. Make sure that both reagents have been completely dissolved in solutions A and B,

respectively. Pipette 50 ml each of solutions A and B into a 1000-ml measuring flask and mix well.

4. Allow the mixed solution to stand for 24 hours at 25 ±3°C.5. Bring the total volume to 1000 ml with deionized water.

This is a 400 NTU formazin standard stock solution and its storage life is one month. To make a standard solution of the desired turbidity, dilute this stock solution with deionized water.

n Preparing a Formazin Calibration Standard SolutionTo make a formazin calibration standard solution, dilute the 400 NTU formazin standard stock solution.

l Precautions• Use clean, high quality laboratory glassware and measure the volume needed accurately.• To dilute the formazin standard stock solution, use deionized water or water filtered through

a 0.2 µm zero turbidity filter.• Before dilution, mix the stock solution thoroughly.

l ProcedureTo make a 2000 ml formazin calibration standard solution of the desired turbidity, take the needed volume of the 400 NTU formazin standard stock solution and dilute to 2000 ml.

Turbidity Aliquot of Stock Solution Total Volume20 NTU 100 ml 2000 ml10 NTU 50 ml 2000 ml5 NTU 25 ml 2000 ml2 NTU 10 ml 2000 ml1 NTU 5 ml 2000 ml



7.3 Zero CalibrationSupply Zero water or turn off the light source to perform Zero calibration. See ■ Zero standard (7.2) to confirm about zero water. [How to perform Zero calibration]

1 Turn on the maintenance mode.2 Clean the Flow cell.3 Prepare to supply Zero water. <Manual supply of Zero water> Remove the top cover at the top of the detector.

Loosen the four screws fixing the clear cover and remove the clear cover. Use a funnel and pour zero turbidity water down the side of the funnel into the Flow cell. Fill the cell with the water to a little higher level than the measurement window. When the Flow cell is filled up to the level, drain the water which has been poured. Pour slowly zero water down the side of the funnel again. Do not allow bubbles enter the cell. When the Flow cell is filled with the zero water for the second time to the level which is a little higher than that of the measurement window, put the top cover in place.

<Using filtered water> Open the valve for zero water and run a filtered water as zero reference. <Zero by light source off> Selectable when the measured turbidity is 40 NTU or above. Turn LED OFF from Maintenance Menu.3 Press on Main screen and go to the calibration menu.4 On the calibration menu, select Zero calibration.5 Confirm the reading is stable. Press [check stability].6 After the message pops saying the reading is stable, confirm that the calibration value is

zero. Then press [Next].7 Check the result of calibration and press [Accept] to update the Zero of the calibration

parameter.8 If Light source has been turned off, turn on the light source. To shift to the slope calibration, proceed to the steps of 7.4 of 7.5. If you finish the operation,

fix the clear cover and feed the sample with the top cover on. Turn off the maintenance mode to end the calibration.



7.4 Slope calibration (Check tool)When you calibrate both zero point and slope, first calibrate the zero point and then the slope. See ■”l Check Tool” to confirm about check tool.[How to perform Slope calibration-Check tool]

1 Turn on the maintenance mode. Remove the top cover from the top of the detector. Loosen the four screws fixing the clear cover and remove the clear cover.

2 Feed the zero turbidity water into the Flow cell to the level little higher than the measurement window. Set the check tool and fix it with four screws.

3 Open the valve for zero turbidity water and run the zero water for five minutes. ( if no piping is installed for the zero turbidity water, use the zero water filed in the Flow cell in the process 2 above, and you skip this process. In this case, make sure that there is no bubble adhered on the surface of the check tool.)

4 Verify that the reading is stable, then shut the valve for supplying zero turbidity water.5 Press on Main screen and go to the calibration menu.6 On the calibration menu, select [Slope calibration (Check tool)] of turbidity manual

calibration.7 Confirm the reading is stable. Press [check stability].8 After the message pops saying the reading is stable, confirm that a value of the check tool is

correctly displayed. Then press [Next].9 Check the result of calibration and press [Accept] to update the Slope of the calibration

parameter.10 Remove the check tool and place the clear cover and the top cover on top of the detector. If

you finish the calibration, run the sample and turn off the maintenance mode.

7.5 Slope calibration (Standard solution)If you perform both Zero and Slope calibration, perform Zero calibration first then do Span calibration. Prepare a standard solution referring to “n Turbidity Standards”

1 Turn on the maintenance mode.2 Press on Main screen and go to the calibration menu.3 Select [Slope calibration (standard solution)] on the calibration menu.4 Remove the top cover from the top of the detector. Loosen the four screws fixing the clear

cover and remove the clear cover.5 Use a funnel and pour the standard solution down the side of the funnel into the Flow cell.

Fill the cell with the solution to a little higher level than the measurement window. When the Flow cell is filled up to the level, drain the standard solution which has been poured. Pour slowly the standard solution for a second time down the side of the funnel again. Do not allow bubbles enter the cell. When the Flow cell is filled with the solution for the second time to the level which is a little higher than that of the measurement window, put the top cover in place.

6 Confirm the reading is stable. Press [check stability].7 After the message pops saying the reading is stable, enter the calibration value. Then press

[Next].8 Check the result of calibration and press [Accept] to update the Slope of the calibration

parameter.9 Drain the sample and clean the Flow cell with zero turbidity water. Place the clear cover and

the top cover on top of the detector. If you finish the calibration, run the sample and turn off the maintenance mode.



7.6 Auto zero calibrationAuto wash and auto calibration run one time. Execute this operation in a measurement mode. Maintenance mode cannot carry out this operation. This operation does not affect any automatic sequence schedule.

7.7 Zero shift correctionPerform this calibration when you need to adjust the Zero value after both Zero and Slope calibration are conducted correctly.

1 Turn on the maintenance mode.2 Press on Main screen and go to the calibration menu.3 On the calibration menu, select [Zero shift correction] in the menu list of Calibration others.4 Run or feed from top of the detector a sample to use the Zero shift correction5 Confirm the reading is stable. Press [check stability].6 After the message pops saying the reading is stable, enter the value in [Cal.point]. Then

press [Next].7 Check the result of calibration and press [Accept] to update the Zero shift value of the

calibration parameter.8 Place the clear cover and the top cover on top of the detector. If you finish the calibration,

run the sample and turn off the maintenance mode.

7.8 Sensitivity correctionUse Sensitivity correction to adjust a difference sensitivity between a standard solution and a grab sample after both Zero calibration and Slope calibration are conducted correctly. Calculate the sample turbidity manually and use the value as a calibration value.

1 Turn on the maintenance mode.2 Press on Main screen and go to the calibration menu.3 On the calibration menu, select [Sensitivity correction] in the menu list of Calibration others.4 Run or feed from top of the detector a sample to use for the Sensitivity correction.5 Confirm the reading stable. Press [check stability].6 After the message pops saying the reading is stable, enter the calibration value (turbidity

value to adjust). Then press [Next].7 Check the result of calibration and press [Accept] to update the Sensitivity correction factor

of the calibration parameter.8 Drain the sample and clean the Flow cell with zero turbidity water. Place the clear cover and

the top cover on top of the detector. If you finish the calibration, run the sample and turn off the maintenance mode.



7.9 2 points correctionThe Zero point and Sensitivity correction factor are adjusted. Use two arbitrary known turbidity solution. Take two measurements and record the low concentration as low point, the high concentration as high point. Be sure to take low point first, then do the measurement of the high point.[How to perform a two point calibration]1. Turn on the maintenance mode.2 Feed the solution for Low point measurement into the Flow cell.3 Press on Main screen to go to the calibration.4 Select [2point calibration] in the menu list of Calibration others.5 Confirm the reading stable. Press [check stability].6 When a message pops saying that the reading is now stable, enter the calibration value.

Press [Next].7 Feed the solution for High point measurement into the Flow cell. Wait until the reading

becomes stable. After it becomes stable, press [check stability].8 When a message pops saying the reading is now stable, enter the calibration value.

Press [Next].9 Confirm the result of calibration. Press [Accept] to update the parameter for Zero shift

value and sensitivity correction factor.10 Drain the sample and clean the Flow cell with zero turbidity water. Place the clear cover

and the top cover on top of the detector. If you finish the calibration, run the sample and turn off the maintenance mode.



7.10 Basic (reference) sensitivity calibration Sensitivity factor(S0) is updated The slope is 100 %. Be sure to perform this calibration after implementing the Zero calibration.No error check is conducted at the calibration, therefore, perform calibration properly. For information on preparation of calibration solution, see “n Formazin Standard Solution”[How to perform basic (basic (reference)) sensitivity calibration]1 Turn on the maintenance mode.2 Press on Main screen to enter the calibration menu.3 Select [basic sensitivity calibration] in the menu list of Calibration others.4 Remove the top cover from the top of the detector. Loosen the four screws fixing the clear

cover and remove the clear cover. 5 Use a funnel and pour standard solution into the Flow cell to a little higher than the level

of the measurement window. When the standard solution is supplied to the level, open the drain valve and drain the solution which has been poured. Pour the solution again slowly. Do not allow bubbles enter the cell. When the Flow cell is filled with the standard solution to the level which is a little higher than that of the measurement window, put the top cover in place.

6 Confirm the reading stable. Press [check stability].7 When a message appears to notice the stabilization is confirmed, enter a calibration

value. Press [Next]. As the calibration value, enter a manually acquired value in the step 2 above.

8 Check the calibration result. Press [Accept] to update a basic (basic (reference)) Sensitivity factor(S0) of calibration parameter. Slope is 100%.

9 To exit the calibration, turn off the maintenance mode.

7.11 Calibration ErrorWhen executing calibration items except for Basic sensitivity calibration, if a calibration result is abnormal, the calibration error is displayed, and the calibration result is discarded. The Acceptable range as follows:

Zero: Acceptable range is wide and hardly error occurs.Slope: 25~200%Zero shift value: -10 ~ 10 NTU

Correction factor: 0.25~4 times

Blank Page

<8. MAINTENANCE> 8-1


8. MAINTENANCEThis chapter describes the inspection and maintenance required to keep the instrument in good operating condition.

n Inspection/Maintenance Items and IntervalsThe main inspection/maintenance items and their recommended intervals to keep the instrument in good operating condition, are provided in Table 8.1. Since the frequency of inspection/maintenance depends on the operating conditions, use the recommended intervals shown in Table 8.1 as a reference and perform inspection/maintenance at appropriate intervals.

Table 8.1 Inspection/Maintenance Items and Recommended IntervalsInspection/Maintenance Item Recommended Interval Reference

sectionWashing of Flow cell Weekly 8.1Washing of head tank Monthly 8.2Calibration Monthly 7Checking and replacing desiccants 6 months 8.3Pipe cleaning 6 months 8.4Replacement of zero turbidity filter element Yearly * 8.5LED replacement 3 years 8.6Grab sample calibration As needed 7Fuse replacement As needed 8.7Replacement of window glass As needed 8.8Replacement of Flow cell As needed 8.9

* This is an interval estimated if tap water used has an average turbidity of 0.4 NTU and runs at a flow rate of 2 L/min.

<8. MAINTENANCE>8-2


8.1 Washing the Flow cellThe top cover (rubber cover) and the clear cover can be removed to clean the inside of the Flow cell and the surface of the window glass. If dirt remains, you can remove the sample outlet pipe and the upper part of the Flow cell to clean every corner in the Flow cell and the window glass.

The Flow cell and window should be washed with mild detergent.(1) Turn on the maintenance mode.(2) Draining the sample.

1. Close the sample supply valve.2. Open the drain valve on the detector to drain the sample.

(3) Washing the Flow cell.1. Open the zero water supply valve to supply zero water to the detector.2. Close the drain valve. When the Flow cell is filled with the zero water, open the drain

valve to drain.3. Repeat steps 1 and 2 at least three times.

(4) Leave the drain valve open.(5) Remove the top cover. Loosen the four screws that secure the clear cover. and remove the

clear cover. Loosen the four screws that secure the Flow cell and remove the upper part of the Flow cell. (See Figure 8.1)

Top cover (rubber cover)

clear cover(transparent)

Screws fixing the upper part ofFlow cell (4 points)

Screws fixingclear cover (4 points)

Figure 8.1 Removing Top cover, Clear cover, upper part of Flow cell

(6) Thoroughly wash the inside of the Flow cell using a sponge or soft cloth soaked in mild detergent. Next, carefully wash the 3 glass windows using a brush or a sponge or soft cloth with cream cleanser. Rinse the inside with zero water (or tap water), as needed.

Window glass

Figure 8.2 Inside the Flow cell and the glass window

(7) Install the upper part of the Flow cell. Fasten the four screws. Be sure to attach the included gasket (67 mm x 119 mm). If the gasket is deteriorated, arrange the replacement (part number: K8003NQ). Install the clear cover. Fasten the four screws. Be sure to attach the included gasket (65 mm x 65 mm). If it is deteriorated, arrange the replacement (part number: K8003NR).



(8) Supply zero water to the detector. When the Flow cell is filled with the water, drain it. Repeat this at least three times to thoroughly rinse off detergent in the Flow cell. See step (3) for valve operation.

(9) Replace the top cover.(10) To go to measurement mode, turn off the maintenance mode switch.(11) Washing is now complete.

8.2 Washing the Head TankThis section describes the procedure for washing the head tank.(1) Turn on the maintenance mode.(2) Close the sample supply valve.(3) Draining water from the head tank and washing it.The following describes how to wash two optional head tanks provided by Yokogawa.[Pressurized head tank]

1. Close the sample valve.2. Loose and remove the drain plug attached to the side of the head tank, to drain the

sample.3. Remove the cover on the top of the head tank. Wash inside the tank using a sponge or

soft cloth soaked in mild detergent. Pour tap water into the tank from above and rinse off thoroughly.

4. Replace the drain plug and the top cover.5. Open the sample valve to run the sample into the head tank and wait until the tank is

refilled.[Simple head tank]With the sample valve open, open and close the drain valve under the head tank at least three times to rinse out the head tank.(4) After washing the head tank, open the sample supply valve to supply the sample to the

detector.(5) To go to measurement mode, turn off the maintenance mode.(6) Washing is now complete.

<8. MAINTENANCE>8-4


8.3 Checking and Replacing DesiccantsInspect the condition of desiccant once every 6 months and replace it if necessary. Regardless of the result of the inspection, replace the desiccant once a year.If the humidity in the detector (the light source unit and the receiver) is high when a sample with low temperature runs into the Flow cell, condensation may form on the window glass. To prevent this, the light source unit and the receiver should be kept dry. Remove the desiccants from the detector unit, and check for softness with the hand. Desiccants that have become soft thoroughly in gel form should be replaced.(1) Putting the converter in the maintenance mode.(2) Loosen the six (6) fixing screws and remove the front cover of the detector unit.(3) Remove the desiccants and check for softness with the hand. Desiccants soft textured in gel

form should be replaced.(4) Install the desiccants. The printed side has to be face down. (See Figure 8.3)(5) Attach the front cover by fastening the six (6) screws.(6) Put the converter in the measurement mode.(7) This completes the replacing procedure.

After checking or replacing desiccants, allow the instrument to warm up for at least one hour before measurement so that desiccants can remove moisture inside the detector.The desiccants absorb moisture from the side on which letters are printed.

Figure 8.3 Installing the desiccants to the front cover

Arrange the desiccants as below.

Table 8.2 DesiccantsPart No. Name Description

K9657RJ Desiccant 4 pcs/Q’ty

8.4 Pipe CleaningRemove the pipes between the detector and the head tank, and clean them.(1) Putting the converter in the maintenance mode.(2) Close the sample supply valve.(3) Close the sample valve and open the drain valve of the head tank to drain the water from

the head tank.(4) Check that the water in the head tank has been drained off. Remove the pipes between the

detector and the head tank. Clean the inside using a long brush or relevant tool, and wash away with tap water. If pipes are heavily stained and dirt cannot be removed, replace them with new ones.

(5) Reinstall the pipes between the detector and the head tank.(6) Open the sample valve to supply a sample to the head tank. Close the drain valve of the

head tank.(7) Open the sample supply valve to supply the sample to the detector.(8) Putting the converter in measurement mode.(9) Pipe cleaning is now complete.



8.5 Replacing the Zero Turbidity Filter ElementThe zero turbidity filter element should be replaced at regular intervals.(1) Make sure that the zero water supply valve and the zero water drain valve after the zero

turbidity filter are closed.(2) Close the tap water valve before the zero turbidity filter to stop supplying tap water.(3) Turn and remove the filter case. (Care should be taken. The internal water runs over.)(4) If the inside of the case is dirty, clean it with a brush or relevant tool.(5) Replace the filter element with a new one.(6) Reassemble the filter. Be sure to install the O-ring in place, otherwise water may leak.(7) Open the tap water valve before the zero turbidity filter to supply tap water and open the

zero water drain valve after the filter to supply zero water. Check for leak.(8) Loosen the air vent valve on top of the zero turbidity filter until the tap water begins to leak

out. After the air vent, tighten the valve securely.(9) Allow the water to flow for at least 20 minutes to wet the filter element.(10) Close the zero water drain valve after the zero turbidity filter.(11) Replacement is now complete.

Note: If the zero turbidity filter is not to be used for a prolonged time, remove, dry and store the filter element in a dry place.

NOTEDo not mix up two different sizes (1 µm and 0.2 µm) of the zero turbidity filter element if installing two zero turbidity filters.

O-Ring

Air Vent

Filter Element

Filter Case

Turn and Remove

F7-12E.ai

Figure 8.4 Replacement of the Zero Turbidity Filter Element

Table 8.3 Filter ElementPart No. Name Description

K9008ZD Filter Element, 1 μmK9726EH Filter Element, 0.2 μm

<8. MAINTENANCE>8-6


8.6 LED Replacement

CAUTION• Turn off the power of TB820D before replacing the LED.• LED may be damaged by static electricity. When replacing the LED be sure to take

measures against static electricity, such as using a grounded wristband.

Although the LED has a normal service life of more than three years, it is recommended that the LED be replaced at an interval of three years in terms of preventive maintenance. Some LEDs may fail within three years.The following describes how to replace the LED.(1) Stop power supply to TB820D.(2) Remove the front cover of the detection unit by loosening the six (6) setscrews.(3) Loosen the 1 setscrew of LED bracket.(4) Rotate upward the LED bracket and remove.(5) Detach the cable connector from the LED bracket. (See Figure 8.6)(6) Replace the LED bracket with a new one.(7) Attach the new LED bracket to the cable connector. (See Figure 8.7)(8) Rotate downward the LED bracket to set.(9) Fasten the 1 setscrew to fix the LED bracket.(10) Fasten the six (6) setscrews on the front cover of the detection unit and attach the cover.

CAUTIONAfter turning on the power of the instrument, warm it up for at least 30 minutes before starting the measurement.

Arrange the LED as below.

Table 8.4 LEDPart No. Name Description

K8003DN LED (red light) for -NT, 660 nm Light sourceK8003DP LED (infrared light) for -FN, 860nm Light source



Front cover

LED bracket

LED bracket

Figure 8.5 LED Replacement

Pinch the strap and remove the lock lever.

Pull out the connector.

Strap

Figure 8.6 Disconnecting cables

<8. MAINTENANCE>8-8


Fix the lock lever.

When properly fixed, it clicks.

Plug in the connector.The side with the solder part faces up.

<Right> <Wrong>

Pinch the strap and push down the lock lever.

Figure 8.7 Connecting cables

8.7 Fuse ReplacementIf the fuse blows, replace the fuse.There is one fuse in the FLXA402T, one in the TB820D, and two in the Relay box (when Suffix code -A5 is selected). Read IM 12A01G01-02JA for fuse replacement of FLXA402T.Replace the fuses of TB820D and Relay box as follows.

CAUTIONBe sure to turn off the power of the instrument before starting the fuse replacement.

CAUTIONBefore opening the front cover of the detector, turn off the power to the TB820D turbidimeter. Make sure that the turbidimeter is not powered before work. Do not touch terminals while the turbidimeter is being powered.

n TB820D fuse replacementBe sure to use A1633EF for the fuse of TB820D.(1) Loosen the four (4) setscrews and remove the Smart unit cover.(2) Take the fuse holder out. (See Figure 8.x)(3) Replace the fuse with a new one.(4) Put the Smart unit cover in place.



Fuse

Figure 8.8 Fuse Replacement

n Relay box fuse replacement (when Suffix code -A5 is selected)Be sure to use A1624EF for the fuse of the Relay box.(1) Loosen the four screws and open the Relay box cover.(2) Remove the two fuse holders. (See Figure 8.9)(3) Replace the fuse with a new one and attach the fuse holder.(4) Close the relay box cover.

Fuse

Figure 8.9 Fuse Replacement (Relay box)


Arrange the fuse as below.Table 8.5 Fuse

Part No. Name DescriptionA1633EF FUSE 1 fuse for TB820DA1624EF FUSE 1 fuse for Relay box (*)

(*) 2 fuses are required for Relay box.

<8. MAINTENANCE>8-10


8.8 Window glass replacementFor TB820D you can replace the window glass of the Flow cell. There are three window glasses in the Flow cell (see Figures 8.2, 8.10).Refer to Section 8.9 when replacing each Flow cell.

<Flow cell left side>(Light source side)

<Flow cell front> <Flow cell right side>

Window glass position-a Window glass position-b Window glass position-c

with oscillator cable (-U1)

Figure 8.10 Window glass positions

Arrange the window glass and O-ring as below.

Table 8.6 Spare parts: Window glass, O-rings, gaskets Part No. Name Description

K8003KS GLASS ASSY 1 window glass (large), 1 O-ring (for window glass position- a and c)K8003KT GLASS ASSY 1 window glass (small), 1 O-ring (for window glass position- b)K8003KV GLASS ASSY 1 window glass (large) with oscillator, 1 O-ring (for window glass

position-a, -U1)K8003NQ Gasket 67 mm × 119 mm, for upper part of Flow cellK8003NR Gasket 65 mm × 65 mm, for clear coverK8003NU Gasket ASSY One gasket each (K8003NQ, K8003NR),

2 O-rings (large), 1 O-ring (small)

CAUTIONBe sure to turn off the power of the instrument before you start replacing the window glass.

n Removal of Flow cell(1) Sample drainage Close the sample supply valve and open the drain valve behind the detector to drain the

sample.



(2) Removal of piping connected to the Flow cell Remove the sample inlet pipe, sample outlet pipe, and sample drainage pipe.

Sample water outlet

Sample water inletDrain

Figure 8.11 Piping removal

(3) Removal of water inside the Flow cell If water remains inside the liquid tank, water droplets may drip inside the TB820D body

when you remove the Flow cell. So you need to remove the water inside the Flow cell sufficiently.

1. Remove the top cover on the top of the Flow cell. Loosen the four screws and remove the clear cover. Loosen the four (4) screws and remove the upper part of the Flow cell. (See Figure 8.12)

2. Wipe the inside of the Flow cell with a soft cloth. 3. In order to prevent the water remaining inside the liquid tank from dripping inside the

TB820D main body, attach the red caps to the sample inlet pipe and the sample drainage pipe. (Figure 8.13).

Top cover (rubber cover)

clear cover(transparent)

Screws fixing the upper part ofFlow cell (4 points)

Screws fixingclear cover (4 points)

Figure 8.12 Removal of Top over, Clear cover, upper part of the Flow cell

Figure 8.13 Attachment of pipe cap



(4) Removal of the oscillator cable (when the suffix code -U1 is selected) Loosen the six (6) screws and open the front cover of the TB820D. Remove the oscillator

cable at the connector as shown in the figure. (See Figure 8.14)

Remove the oscillator cableat the connector.

Figure 8.14 Removal of the oscillator cable

(5) Removal of Flow cell First, remove the two nuts on the sample inlet and the sample drain at the bottom of the

Flow cell. Next, loosen the six (6) screws on the top of the Flow cell. In this state, pull up the Flow cell and remove the Flow cell.

If Suffix code -U1 is selected, the oscillator and oscillator cable are attached to the Flow cell. Be careful not to damage the oscillator cable when removing the Flow cell. (See Figure 8.15).

Nuts at the bottom of the Flow cell (2 positions)

Flow cell fixing screws (6 positions)

Figure 8.15 Removal of Flow cell

n Window glass replacementThere are three window glasses. (See Figure 8.10)Loosen the four (4) screws (two for position-2), remove the window glass and O-ring, and replace with a new one.When the suffix code -U1 is specified, attach the window glass with the oscillator to the window glass position-1. Install the window glass so that the oscillator cable does not interfere with the optical path when it is pulled out in the direction shown in the figure (upper right in Figure. 8.10).

.CAUTION• When removing the window glass, wipe off any water remaining on the window glass

mounting part with a dry cloth. If moisture remains in this area, condensation may form on the window glass, which may affect the measurement.

• Do not allow fingerprints or other stains to adhere to the window glass. If it gets dirty, wipe it off completely with the included silicone cloth. Fingerprints on the window glass may affect the measurement.



n Installation of Flow cell(1) Installation of Flow cell Install the Flow cell whose window glass has been replaced. If the suffix code -U1 is

specified, thread the oscillator cable through the hole as shown in the figure. (See Figure 8.8.) First, tighten the six (6) screws on the top of the Flow cell. Next, tighten the two nuts on the sample inlet and the sample drain at the bottom of the Flow cell.

NOTEIf you tighten the pipe nut first and then the six (6) screws on the top of the Flow cell, the piping nuts are tightened loosely.

Hole for passing the oscillator cable

Figure 8.16 Hole for the oscillator cable (front view)

(2) Oscillator cable installation (Suffix code -U1 selected) Connect the oscillator cable to the connector and secure it with a clip as shown in the figure.

Close the front cover of the TB820D and tighten the six (6) screws. (See Figure 8.17)Connect the oscillator cableat the connector.

Secure the oscillator cablewith the clip.

Figure 8.17 Connecting and fixing the oscillator cable

(3) Installation of the upper part of Flow cell and others 1. Install the upper part of the liquid tank. Tighten the four screws.

Be sure to attach the attached gasket (67 mm x 119 mm). If it is deteriorated, arrange for K8003NQ and replace it.

2. Install the clear cover. Tighten the four screws. Be sure to attach the attached gasket (65 mm x 65 mm). If it is deteriorated, arrange for K8003NR and replace it.

3. Install the top cover on the top of the Flow cell.(4) Installation of piping connected to Flow cell Install the sample inlet pipe, sample outlet pipe, and sample drainage pipe.(5) Running sample 1. Close the drain valve behind the detector. 2. Open the sample supply valve. In this state, make sure that there is no water leakage.




The following items are also available as spare parts. Replace them if necessary.

Table 8.7 Top cover, clear coverPart No. Name Description

K8003EZ CLEAR COVER ASSY Transparent window at the top of the Flow cellK8003MZ COVER Top cover (rubber cover)G9330DC CAP Piping cap

8.9 Flow cell replacementYou can replace Flow cell of TB820D. Arrange a replacement for Flow cell according to Table 8.8. Figure 8.18 shows an example of Flow cell for replacement.A window glass is attached to the replacement Flow cell in advance. If the suffix code -U1 is selected, the oscillator is attached to the Flow cell window.Refer to Section 8.8 for how to replace Flow cell.

with oscillator cable (-U1)without oscillator cable (-NN)

Figure 8.18 Example of replacement Flow cell

Table 8.8 Flow cellPart No. Name Description

K8003ED CELL ASSY For TB820D-□□-□□-NNK8003EM CELL ASSY For TB820D-□□-□□-U1

<9. TROUBLESHOOTING> 9-1


9. TROUBLESHOOTING9.1 When an error occurs

Table 9.1 TB820D Error List

Alarm Number

Name Explanation Remedy NE107 Default

NE107 Changed

X500 EEPROM error The TB820D has become defective. Contact Yokogawa service.

F Disable

X501 User param. read error The TB820D has become defective. Contact Yokogawa service.

F Disable

X502 Factory param. read error

The TB820D has become defective. Contact Yokogawa service.

F Disable

X503 AD converter failure AD converter of the main board failure

The TB820D has become defective. Contact Yokogawa service.

F Disable

X504 RAM failure RAM failure The TB820D has become defective. Contact Yokogawa service.

F Disable

X505 Flash Memory failure Flash Memory failure The TB820D has become defective. Contact Yokogawa service.

F Disable

X50A Sensor communication error

No sensor is detected.

Check the power supply connection.Check the connection between the detection unit and the converter.Check whether the connected sensor type matches the one in the Model and Suffix Code.

F Enable

X520 Wash/Cal. box error Relay box does not work.

Check the connection of Relay box or configuration (Enable/Disable.)

S Disable

X521 Humidity sensor failure Humidity sensor does not work.

Open the front cover and check the cable connection of the front detector board.If the cable is correctly connected, replace the detector board. When you replace the detector board, you need to perform turbidity calibration.

S Enable

X540 Turbidity High Turbidity value is exceeded high limit setpoint.

Check measurement value.Confirm Turbidity warning high limit on sensor setting.

S Enable

X541 Turbidity Low Turbidity value is less than low limit setpoint.

Check measurement value.Confirm Turbidity warning low limit on Sensor setting.

S Enable

X542 Light detection error Photodetector current is out of range.

Check the scattered light current. Identify where the error occurs : Flow cell, light source board, detector board. After then, bring it back to a normal state.

S Enable

<9. TROUBLESHOOTING>9-2


Alarm Number

Name Explanation Remedy NE107 Default

NE107 Changed

X543 Light source failure Light source intensity is abnormal.

Check light source monitoring current and Lightning IF. If value is abnormal, open the front cover and check the cable connection or assemble condition. If the cause is not found, please replace the Light source part.

S Enable

X54E Auto Zero cal result error

Result of auto zero calibration is out of range.

Confirm the solenoid valve runs correctly by manual operation. Check if the zero water flows normally. If no error is found in the sampling, check whether no condensation is found on Measurement window.

S Enable

X54F Auto Cal stability time limit

Detection value is not stable during auto calibration.

S Enable

Note : X of Alarm Number denotes Channel of the measurement electrode unit. 1: sensor connection number 1-1 5: sensor connection number 2-1 6: sensor connection number 2-2 (not required on the first FD)

Table 9.2 TB820D Analyzer Error Message List (Wash)

Alarm Number

Name Explanation Remedy Default (NE107)

Error config. (HMI)

009E Auto wash config. error Auto wash is not properly set.

Check auto wash setting.Converter setting > Auto wash > Auto calib. setting

C Enable

009F Disable auto update of next start

Auto wash/calibration is overdue.

Set the first calibration start time. Converter setting > Auto wash> Auto calib. setting

C Enable

<9. TROUBLESHOOTING> 9-3


9.2 When No Error Indication AppearsThere is a possibility that measurement has abnormalities without any error occurrence. Next table shows some possible causes. Solve the problems referring to the next table.

Table 9.3 Abnormalities, Their Possible Causes, and Remedies

Abnormalities Possible Causes RemediesMeasured value fluctuates largely.

● Sample air bubble or contamination stays in flow cell.

● The measured value fluctuates according to the sample turbidity.

● Clean the Flow cell..● Bring the air denoising head tank which

is equipped upstream of the sample inlet, to a normal state.

● Adjust the sample outlet valve to increase the pressure inside the Flow cell.

● Check if the turbidity reading is stable by using Zero water or Check tool. If the reading is not stable, identify where the error occurs in Flow cell, Light source, or Detector board. After then, bring it to a normal state.

● If no error is found in the instrument or sample flow, set larger value of measurement time constant.

Measured value increased over time

● Inside of the detector cell is contaminated.

● Air bubbles adhere to the surface of glass window.

● Glass window has condensation.● Glass window is scratched.

● Clean the glass window or inside wall of the Flow cell.

● Reduce sample flow rate by controlling the valve at the outlet to higher the pressure level inside the Flow cell.

● Check the condition of desiccant. Replace it if necessary with new one.

● If the measured value does not go down even after trying the remedies from 1 to 3 above, check if the glass window is scratched. If any scratch is found, replace the Flow cell.

Measured value abruptly increases but plunged in a short time

● Air bubbles or contamination pass through the flow cell.

● Reduce sample flow rate by controlling the valve at the outlet to higher the pressure level inside the Flow cell.

● Turn on the Air denoising function.● Optimize the air denoising parameter.

Measured value does not vary.

● Light source is abnormal.● Communication between Detector

and Liquid analyzer is abnormal.

● Check the light source is lit on.● Check the cable connection between

FLXA402T Analyzer and TB820D detector.

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<APPENDIX> App.-1


Appendix Automatic wash/Automatic calibration Sequence

The next diagrams show how the solenoid valve works during TB820D Automatic wash / Automatic calibration.

n During Automatic washThe parameters on Valve working during Automatic wash are as follows.

● Drainage time● Washing time● Repeat count of wash● Recovery time

◆Automatic wash

Status

SV1(Sample)

SV2(Wash. water)

SV4(Drain)

OPEN

CLOSE

OPEN

CLOSE

OPEN

CLOSEDrainage time Drainage time

Washing

Recovery time

Meas. Recovery Meas.Washing

1: When Automatic wash starts, SV1 (valve for sample) closes and shut the sample feeding. At the same time, SV4 (valve for drain) opens and starts draining the sample out of the flow cell.

2: After the “drainage time” elapses, SV4 closes and SV2 (valve for washing water) opens and TB820D starts feeding washing water.

3: During the “washing time”, SV2 stays open, SV4 stays closed.4: After the washing time elapses, SV4 opens and TB820D starts draining the washing

water out of the flow cell.5: If “Repeat count of wash” is set to over 1, valve working1 to 4 is repeated.6: Once the draining for washing completes, SV4 closes, SV1 opens, and TB820D starts

feeding a sample and go to “Recovery time”.7: After the sample feeding starts when the Recovery time elapses, the automatic wash

sequence ends and a measurement starts.

<APPENDIX>App.-2


n During Automatic calibrationThe parameters on Valve working during Automatic calibration are as follows.● Drainage time● Flow waiting time● Recovery time

“Calibration time” refers to the period from Stability check to an execution of Calibration and a completion of parameter update.

◆Automatic calibration

Status

SV1(Sample)

SV2(Wash. wate)

SV3(Zero)

OPEN

CLOSE

OPEN

CLOSE

OPEN

CLOSE

SV4(Drain)OPEN

CLOSEDrainage time Drainage time Drainage time

Flow waitingtime

Calibrationtime

Drainage time

Flow waitingtime

Washing time

Recovery time

Meas. Recovery Meas.CalibrationWashing

1: When sequence starts, Automatic wash works first. See 1 to 5 in ■ During Automatic wash.

2: Automatic calibration starts without a recovery time after Automatic wash.3: When Automatic calibration starts, SV4 closes, SV3 (valve for zero water) opens and a

zero water starts filling the flow cell.4: After the calibration preparation time has elapsed, SV4 opens and the zero water in the

Flow cell is drained once. After the drainage is completed, pass the zero water for the calibration preparation time again and the calibration starts.

5: After the calibration time elapses, SV3 closes, SV4 opens, and TB820D starts draining the zero water out of the flow cell.

6: After the draining finishes, SV4 closes, SV1 opens, and TB820D starts feeding a sample into the flow cell.

7: After the sample feeding when the Recovery time elapses, Automatic calibration sequence ends and a measurement starts.

CustomerMaintenanceParts List


CMPL 12E01B30-01EN1st Edition: May 2021 (YK)

1

6 734

5

2

11

1098

Item Part No. Qty Description1 K8003DN 1 LED Assy (red)

K8003DP 1 LED Assy (infrared)2 K9657RJ 1 Desiccant3 K8003EZ 1 Clear Cover Assy4 K8003MZ 1 Cover

5 K8003ED 1 Cell AssyK8003EM 1 Cell Assy for -U1 (with ultrasonic cleaning)

6 K8003KS 1 Glass Assy (1 window glass (large), 1 O-ring)K8003KV 1 Glass Assy (1 window glass (large) with oscillator, 1 O-ring)

7 K8003KT 1 Glass Assy (1 window glass (small), 1 O-ring)

8 K8003NQ 1 Gasket (67 mm × 119 mm)9 K8003NS 1 Gasket (65 mm × 65 mm)10 K8003NU 1 Gasket Assy (One gasket each (K8003NQ, K8003NS), 2 O-rings (large), 1 O-ring (small)11 A1633EF 1 Fuse

All Rights Reserved. Copyright © 2021 Yokogawa Electric Corporation.Subject to change without notice.

2

1st Edition: May 2021 (YK) CMPL 12E01B30-01EN

Relay box (for -A5)

1

Item Part No. Qty Description1 A1624EF 2 Fuse

3

1st Edition: May 2021 (YK) CMPL 12E01B30-01EN

K9411UAZEROTURBIDITYFILTERASSEMBLY(1micronfilter) K9726EFZEROTURBIDITYFILTERASSEMBLY(0.2micronfilter)

4

57

1

2

3

6

Item Part No. Qty Description1 K9008ZD 1 Filter Element (1 micron)

K9726EH 1 Filter Element (0.2 micron)2 K9411UB 1 Case3 K9008ZE 1 Plate4 K9411UD 1 O-Ring

5 K9411UC 1 O-Ring6 K9411UE 1 O-Ring7 K9411UF 1 Head

i


Revision Informationl Title: TB820D Right Angle Scattered Light Turbidity Detectorl Manual No.: IM 12E01B30-02EN

Oct. 2021/3rd Edition Corrected the wiring diagrams. (pages 2-2, 2-3)

June 2021/2nd Edition Added a Model and Suffix code (page 1-3) Corrected errors (pages 1-3, 2-7) Added a section/description (pages 3-4, 7-4, 8-4)

Mar. 2021/1st Edition Newly published.

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TB820D Right Angle Scattered Light Turbidity Detector

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