Triton DO8 Manual L1008 - Gilson Eng Manuals/ecd/Triton_DO8_Manual.pdf · Triton DO8 Page 3 2.0...

Rev. A 82608

ELECTRO‐CHEMICAL DEVICES, INC.

Triton DO8 Optical Dissolved Oxygen Sensor

Instruction Manual

ELECTRO‐CHEMICAL DEVICES, INC. 23665 Via Del Rio, Yorba Linda, CA 92887, USA Tel: +1‐714‐692‐1333, FAX: +1‐714‐692‐1222

www.ecdi.com

Page ii Triton DO8

PREFACE Purchasing products from Electro‐Chemical Devices, Inc. provides you with the finest liquid analytical instrumentation available. If this is your first purchase from ECD, please read this manual before installing and commissioning your new equipment.

If there are any questions concerning this equipment, please contact your local ECD representative, or the factory directly at:

ELECTRO‐CHEMICAL DEVICES, INC. 23665 Via Del Rio

Yorba Linda, CA 92887 USA Telephone: +1‐714‐692‐1333

FAX: +1‐714‐692‐1222 Website: www.ecdi.com Email: [email protected]

© 2008 Electro‐Chemical Devices, Inc. All rights reserved. No part of this manual may be used or reproduced in any form or by any means, or stored in a database or retrieval system without prior written permission from Electro‐Chemical Devices, Inc. Making copies of any part of this manual for any purpose other than personal use is a violation of United States copyright laws. Document printed in the United States of America.

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Table of Contents

PREFACE ........................................................................................................................................................ ii

WARRANTY ................................................................................................................................................... v

IMPORTANT SERVICE INFORMATION ........................................................................................................... v

UNPACKING THE INSTRUMENT.................................................................................................................... vi

1.0 General Information ............................................................................................................................... 1

1.1 How it works ....................................................................................................................................... 1

1.2 Applications ......................................................................................................................................... 2

1.3 Influences on the Measurement ......................................................................................................... 2

2.0 INSTALLATION ......................................................................................................................................... 3

2.1 Parts List .............................................................................................................................................. 3

2.2 Mounting the Instrument ................................................................................................................... 3

2.3 Installing the Sensor Assembly ........................................................................................................... 3

2.3.1 Choosing an Installation Site ........................................................................................................ 3

2.3.2 Flow‐Thru Installations................................................................................................................. 3

2.3.3 Immersion Installations ................................................................................................................ 3

2.4 Mounting Assemblies .......................................................................................................................... 4

2.4.1 Immersion Assembly .................................................................................................................... 4

2.4.2 Handrail Mounting Assembly ....................................................................................................... 4

2.4.3 Flow Through Assembly ............................................................................................................... 5

2.5 Wiring the Instrument ........................................................................................................................ 6

2.5.1 Wiring the Power ......................................................................................................................... 6

2.5.2 Wiring the Outputs ...................................................................................................................... 6

2.5.3 Wiring the Sensor ......................................................................................................................... 6

2.5.4 Functional Check .......................................................................................................................... 6

3.0 Menu Structure and Configuration ......................................................................................................... 7

3.1 General Menu Structure ..................................................................................................................... 7

3.2 Setup Menu, Outputs and Relays ....................................................................................................... 8

3.3 Configuration/Trim Menu ................................................................................................................. 11

4.0 Start Up ................................................................................................................................................. 14

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4.1 Functional Check ............................................................................................................................... 14

4.2 Powering up the Instrument ............................................................................................................. 14

4.3 Calibration ......................................................................................................................................... 14

4.3.1 Frequency of Calibration ............................................................................................................ 14

4.3.2 Zero Point Calibration ................................................................................................................ 14

4.3.3 Air Calibration ............................................................................................................................ 14

4.3.4 Standardization, a Referenced Cal ............................................................................................. 16

4.3.5 Calibration Screens .................................................................................................................... 16

5.0 Maintenance ......................................................................................................................................... 19

5.1 Maintenance Procedure ................................................................................................................... 19

5.2 Cleaning the Sensor .......................................................................................................................... 19

5.2.1 Cleaning the Internal Optics....................................................................................................... 19

5.3 Replacing the Fluorescence Cap ....................................................................................................... 20

5.3.1 Removing the Old Fluorescence Cap ......................................................................................... 20

5.3.2 Installing the New Fluorescence Cap ......................................................................................... 20

5.4 Air Blast Spray Head Cleaner............................................................................................................. 20

6.0 Troubleshooting .................................................................................................................................... 21

6.1 Symptom/Remedy Guide .................................................................................................................. 21

6.2 Sensor Checks ................................................................................................................................... 21

7.0 Product Specifications ........................................................................................................................... 22

8.0 Spare Parts and Accessories ................................................................................................................. 23

8.1 Exploded View ................................................................................................................................... 23

8.2 Sensor and Analyzers ........................................................................................................................ 23

8.3 Accessories ........................................................................................................................................ 23

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WARRANTY Electro‐Chemical Devices, Inc. (ECD) warrants all products it manufactures to be free from defect in materials and factory workmanship, and agrees to repair or replace any product that fails to perform, as specified, within one (1) year after date of shipment. This warranty shall not apply to any product that has been:

1. Subjected to misuse, negligence or accident; 2. Connected, installed, adjusted or otherwise used not in accordance with the instructions furnished by ECD; 3. Repaired, modified or altered by persons not authorized by ECD, resulting in injury to the performance, stability or

reliability of the product.

This warranty is in lieu of any other warranty, expressed or implied. ECD reserves the right to make changes in the design or construction of its products at any time, without prior notification, and without incurring any obligation to make any changes in previously delivered products.

Seller’s sole liabilities and the buyer’s sole remedies under this agreement shall be limited to a refund in the purchase price, or at ECD’s discretion, to the repair or replacement of any product that proves, upon ECD’s examination, to be defective, when returned to the factory, transportation prepaid by the buyer, within one (1) year of the product’s original shipment date. Seller shall not be liable for damages consequential or incidental to defects in any product, for failure of delivery in whole or in part, for injuries resulting from its use, or for any other cause.

This warranty and the writing attached constitute the full understanding of seller and the buyer, and no terms, conditions, understanding, or agreement purporting to modify or vary the terms hereof shall be binding unless hereafter made in writing and signed by an authorized official of Electro‐Chemical Devices, Inc.

This warranty does not cover pH, ORP or Specific Ion measurement, reference or combination electrodes or electrode cartridges that have been commissioned in service.

IMPORTANT SERVICE INFORMATION Use only factory authorized components for repair. Tampering or unauthorized substitution of components may adversely affect the operation of this product and may void the warranty.

If service or repair is required, please obtain the serial number(s) or sales order number of the product(s) in question and contact ECD’s Service Department at:

+1‐800‐729‐1333 (USA/Canada) or +1‐714‐692‐1333 or email [email protected]

A Return Material Authorization (RMA) number must be obtained from the service department before returning any material to ECD. All material returned to ECD shall be shipped prepaid to the factory.

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UNPACKING THE INSTRUMENT Your Electro‐Chemical Devices instrument has been carefully packaged to protect it from damage during shipment and dry storage. Upon receipt please follow the procedure outlined below.

1. Before unpacking, inspect the condition of the shipping container to verify proper handling by the carrier. If damage is noted, save the shipping container as proof of mishandling for the carrier.

2. Check the contents of the shipping container with the items and quantities shown on the packing list. Immediately report any discrepancies to ECD.

3. Save the original packing material until you are satisfied with the contents. In the event the product(s) must be returned to ECD, the packing material will allow you to properly ship it to ECD.

Familiarize yourself with the instrument before installation, and follow proper installation and wiring procedures.

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1.0 General Information The Triton DO8 is an optical dissolved oxygen sensor that uses “fluorescence quenching” to determine the oxygen concentration in water. This optical method minimizes maintenance, increases reliability and improves the long term accuracy of the measurement when compared to a Polarographic sensor. The Triton DO8 combines this improved measurement technology with a rugged, easy to install design that provides the best solution for long term measurements in aeration basins, aquaculture and all types of environmental water.

1.1 How it works A circular layer of optically active, oxygen sensitive molecules are integrated into an easily replaceable cap. The layer is highly permeable to oxygen and rapidly equilibrates to its surroundings. The cap aligns the optically active fluorescence layer above two optical components inside the sensor, an emitter and a detector. The emitter flashes a green light at the layer and the layer fluoresces back a red light, the duration and intensity of the fluorescence are directly dependent on the amount of oxygen in the layer.

Fig. 2 Exploded View

1. Cable 5. Threaded Connection 2. Sensor Body 6. Detector 3. O‐ring 7. Emitter Diode 4. Protective Cap 8. Fluorescence Cap

Fig. 1 DO8 Dimensions

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With little to no oxygen in the layer the response is long and intense. Oxygen quenches the fluorescence response so as the oxygen level increases the response becomes shorter and less intense. Both the time and intensity values are used to calculate the oxygen level and various diagnostics functions associated with the measurement.

The optical signals are continuously monitored and analyzed for reliability inside the sensor. The oxygen level, water temperature and air pressure are included in the various calculations. The aging of the sensor cap is monitored and reported to the C‐22 controller as are any implausibly high or low oxygen values detected by the sensor. The digital communication provides a trouble free connection between the Triton DO8 sensor and the C‐22 controller that is unaffected by the EMI noise so common at waste water treatment plants.

1.2 Applications The Triton DO8 is designed for the continuous measurement of dissolved oxygen in water. Typical applications include;

• The measurement and control of the oxygen in aeration basins,

• The monitoring of oxygen in the effluent from a sewage treatment plant,

• The measurement and control of the oxygen content of public water supplies,

• The measurement and control of the oxygen at fish farms.

• The oxygenation of drinking water.

The sensor is suitable for most environmental water measurements but may be incompatible with some waste water treatment processes. Applications outside of the scope of applications listed above may compromise the integrity of the sensor and should not be attempted without first consulting the factory. Non‐designated use of the Triton DO8 voids all warranties.

1.3 Influences on the Measurement The Triton DO8 is unaffected by changes in the flow, pH or conductivity of the sample. Higher flow rates minimize the growth of biofilms on the sensor and are therefore advantageous. If biologic fouling is expected to occur as it does in most environmental waters and aeration basins at sewage treatment plants the Air Blast Spray Cleaner (P/N 1000226) should be purchased with the sensor.

The sample temperature is monitored by the sensor and the various measurements are automatically temperature compensated. Temperature compensation is critical to the accuracy of the measurement. When the sensor is submersed in water, equilibration to temperature changes occurs rapidly but when performing an Air Calibration equilibration occurs much more slowly. Allow 10‐20 minutes for the sensor to equilibrate before starting an air calibration.

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2.0 INSTALLATION

2.1 Parts List The Triton DO8 measurement system is comprised of;

• Triton DO8 sensor (P/N 1397000‐1 with 7 meter (23 ft.) cable or 1397001‐1, 15 meter (49 ft).) o (1) Triton DO8 Manual, (1) C22 Configuration Manual

• C‐22 DO Analyzer o (P/N 16F01221.F000, Single Channel Analyzer) o (P/N 16FF2421.FF00, Dual Channel Analyzer)

• Instrument Mounting Kit (user specified) o Universal Mounting Plate (P/N 2000271) o Panel Mounting Kit (P/N 2000272) o Handrail Mounting Kit (P/N 2000263)

• Sensor Mounting assembly o Immersion Assembly (P/N 1000223) o Flow through Assembly (P/N 1000219)

• Accessories (optional) o Air Blast Spray Cleaner (P/N 1000226) o Mounting Brackets (P/N 2000278, 2” Handrail Swivel Mounting) o Remote Junction Box (P/N 1000222)

2.2 Mounting the Instrument Select a location that is vibration free and easy to access. The C‐22 analyzer is rated NEMA 4X and can be mounted outdoors but it is best to provide a covering to protect the instrument from rain and direct sunlight. Follow the instructions supplied with the Mounting Kit for mounting the instrument.

2.3 Installing the Sensor Assembly

2.3.1 Choosing an Installation Site The installation point should provide easy access for Cleaning and Calibration of the sensor and be representative of the water to be measured.

2.3.2 Flow‐Thru Installations The sensor should be mounted upright in Flow Through installations. Horizontal mounting is acceptable, inverted installation or at angles less than horizontal are not recommended due to problems with sedimentation influencing the reading.

2.3.3 Immersion Installations The sensor must always be mounted using the immersion assembly. Never suspend the sensor by the cable, avoid jerking or pulling on the cable. The cable is water tight but not waterproof, extended service with the cable submerged in water may lead to sensor failure. Verify that all threads on the immersion assembly are properly sealed and the sensor is not filling with water when submerged.

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2.4 Mounting Assemblies

2.4.1 Immersion Assembly

2.4.2 Handrail Mounting Assembly

Figure 5 Handrail Mounting Assembly

Fig. 3 Horizontal Bracket Mounting Fig. 4 Vertical Bracket Mounting

1. Protective Cover 2. Mounting Fitting 3. Support Pipe 4. Mounting Bracket 5. Sensor release

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2.4.3 Flow Through Assembly

Fig. 6 Flow assembly PN1000219

1. Screw‐in part for sensor 2. Screw ring 3. Meter body 4. Connection thread G¾ 5. Dummy plug

Fig. 7 Bypass Installation

1. Main line 2. Sample return 3. Oxygen sensor 4. Manually actuated or solenoid

valves 5. Flow assembly (PN 1000219) 6. 90 ° pipe bracket 7. Manually actuated or solenoid

valves 8. Sample Input

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2.5 Wiring the Instrument

2.5.1 Wiring the Power Electrical wiring should only be conducted by qualified personnel.

Open the C‐22 analyzer to access wiring.

Feed the power cable (not supplied) through the cable gland on the right hand side of the instrument.

Connect the power cord to the 3 slot terminal as shown on the wiring diagram inside the C‐22.

2.5.2 Wiring the Outputs Electrical wiring should only be conducted by qualified personnel.

Disconnect or Turn off the Power to the C‐22 Analyzer and open the Analyzer to access the wiring.

Feed the 4‐20 mA communication cable (not supplied) through the cable gland on the left hand side of the instrument.

Connect the cable to the 2 slot terminal block as shown on the diagram inside the C‐22.

Feed the Alarm/relay cable (not supplied) through the cable gland on the right hand side of the instrument, the same cable gland as the power cable.

Connect the cable to the 2 slot terminal block as shown on the wiring diagram inside the C‐22.

2.5.3 Wiring the Sensor Electrical wiring should only be conducted by qualified personnel.

Disconnect or Turn off the Power to the C‐22 Analyzer and open the Analyzer to access the wiring.

Feed the DO8 sensor cable through the center cable gland on the bottom of the C‐22 and attach the wires to the Green terminal block as described below. A copy of the wiring diagram is also located inside the C‐22 analyzer.

Table 1 DO8 sensor wiring detail

Triton C‐22 DO8 Wire Color Wire Function / AssignmentTerminal # 1 Yellow (+) PowerTerminal # 2 Grey Ground (0V)Terminal # 3 Brown (‐) PowerTerminal # 4 Pink Digital CommunicationTerminal # 5 Blue Digital CommunicationTerminal # 6 None No connection

2.5.4 Functional Check Before powering the instrument, verify the wiring is correct. Verify the DO8 sensor is properly installed in the immersion tube or flow cell and that there are no leaks.

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3.0 Menu Structure and Configuration The Triton DO8 analyzer is offered as a single channel or dual channel analyzer. The menu structure is the same as most C22 analyzers. Follow the table below for a tour through the top level menus. The blinking cursor indicates the selection point in each of the menus.

3.1 General Menu Structure #1 Home Screen

#2Press MENU SELECT down key to move to Channel #1 Dissolved Oxygen Sensor. (PV 1)

#3 The Channel #1 Screen, all adjustments to Sensor #1 are made from this screen. Press the MENU SELECT down key to proceed.

#4 Graphical display of sensor performance, configure in the Setup Menu. Press the MENU SELECT down key to proceed.

#5 Parameter Selection Screen. The Cursor is high‐lighting the Buffer Menu. Press the MENU SELECT down key to proceed.

#6Parameter Selection Screen. The Cursor is high‐lighting the Setup Menu. Press the MENU SELECT down key to proceed.

#7 Parameter Selection Screen. The Cursor is high‐lighting the Status Menu. Press the MENU SELECT down key to proceed.

#8The Cursor is high‐lighting the Configure /Trim Menu. Press the down CALIBRATION key to return to the HOME screen.

#9 Press MENU SELECT Up key to move to Channel #2 Dissolved Oxygen Sensor. (PV 2)

#10The Channel #2 Screen, all adjustments to Sensor #2 are made from this screen. Press the MENU SELECT up key to proceed.

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#11 Parameter Selection Screen. The Cursor is high‐lighting the Status Menu. Press the MENU SELECT up key to proceed.

#12Parameter Selection Screen. The Cursor is high‐lighting the Setup Menu. Press the MENU SELECT up key to proceed.

#13 Parameter Selection Screen. The Cursor is high‐lighting the Buffer Menu. Press the MENU SELECT up key to proceed.

#14The Cursor is high‐lighting the Contrast Menu. Simultaneously press the CALIBRATE keys to enter Contrast Adjustment screen.

#15 Press the Up or Down CALIBRATE keys to adjust the screen contrast.

#16Press either MENU SELECT key to accept the adjustment.

#17 Scroll back to the Main Screen using the MENU SELECT keys, or ….

#18Press the down CALIBRATE key to Jump back to the Home Screen.

3.2 Setup Menu, Outputs and Relays #1 Home Screen Scroll down to the Ch 1 Setup Menu using the down MENU SELECT key, 4X

#2Enter the Setup Menu by simultaneously pressing the two horizontal CALIBRATE keys

#3 The PLOT Screen shows the output parameter displayed in the Graphical Display. Scroll down using the MENU SELECT key.

#4Sample adjusts the time units of the Graphical Display. (.1 m equals 10 data points per minute) Scroll down using the MENU SELECT key.

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#5 The 4‐20 mA1 output range is set in this menu. The default value is set at 0‐20 mg/l. Scroll down using the MENU SELECT key.

#6Adjust the 20 mA1 Range. Enter the 20 mA1 Range by simultaneously pressing the horizontal CALIBRATE keys.

#7 Move the cursor to the point under the largest integer that you wish to change with the horizontal CALIBRATE keys.

#8Adjust the value with the vertical CALIBRATE keys.

#9 Accept the Change with either of the MENU SELECT keys.

#10Return to the Home Screen by pressing the down CALIBRATE key or…

#11 To remain in the Setup Menu and proceed to the Relay Contacts set up screen press the MENU SELECT down key

#12Press the MENU SELECT down key to scroll through the Relay Set up menus to the next menu or….

#13 Enter the Relay #1 On Set up screen by simultaneously pressing the horizontal CALIBRATE keys.

#14Move the cursor to the point under the largest integer that you wish to change with the horizontal CALIBRATE keys.

#15 Adjust the value with the vertical CALIBRATE keys. In this example Relay #1 On is a High Alarm.

#16Accept the Change with either of the MENU SELECT keys.

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#17 Scroll down to the Relay #1 Off set up using the MENU SELECT down key.

#18Enter the Relay #1 Off Set up screen by simultaneously pressing the horizontal CALIBRATE keys.

#19 This sets the Relay #1 hysteresis; the relay closed (On) at 7 mg/l and will open (Off) when the value drops below the set value.

#20Move the cursor under the digit to be changed and adjust the value with the vertical CALIBRATE keys.

#21 Move the cursor under the digit to be changed.

#22Adjust the value with the vertical CALIBRATE keys. Relay #1 will now close at 7 mg/l and open when the DO drops below 6.8 mg/l.

#23 Accept the change with either of the MENU SELECT keys. Scroll down to Relay #2 On.

#24Enter the Relay #2 On Set up screen or scroll down to Relay #2 Off.

#25 Scroll down to the Salinity Screen using the down MENU SELECT Key

#26Enter the Salinity Set Up screen by simultaneously pressing the horizontal CALIBRATE keys.

#27 Move the cursor under the digit to be changed with the horizontal CALIBRATE keys.

#28Adjust the value of the salinity using the vertical CALIBRATE keys.

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#29 Press the MENU SELECT Key to accept the Salinity value. Press the MENU SELECT down key again to move to the Noise Filter Screen.

#30Enter the Noise Filter Set Up screen by simultaneously pressing the horizontal CALIBRATE keys.

#31 Adjust the value with the vertical CALIBRATE keys. The number indicates the number of samples averaged together.

#32Accept the change with either of the MENU SELECT keys.

3.3 Configuration/Trim Menu The Triton DO8 is configured at the factory but there are several menus that the user may wish to change such as the units of measure, assignment of the Outputs and Relays and the base elevation of the instrument, set at 0 meters (sea level). See the ECD Configuration Manual for a detailed explanation.

#1 Home Screen Scroll down to the Configure/Trim menu using the MENU SELECT down key, press 6 X.

#2Enter the Configure/Trim Menu by simultaneously pressing the horizontal CALIBRATE keys.

#3 Pass word Protection is available for Operational and/or the Configuration displays.

#4Default Display allows the choosing of which screen is displayed when the Home Key is actuated. (Calibrate down = Home Key)

#5 The 4 – 20 assign Menu allows the output to be assigned to a specific parameter.

#6Manual Mode Menu assigns which parameter is displayed in the % output of the main screen.

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#7 Relay assign/test Menu allows the assignment and configuration of the relay contacts.

#8PID Assign Menu allows the assignment of one or two channels of control functions to be assigned to the Outputs and/or Relays.

#9 PWM assign Menu Pulse Width Modulation assignment

#10Clock and Timers Menu allows configuration of the Timers and the clock.

#11 Logic Gates Menu assigns and configures the 2‐input “OR” gates.

#12General Menu Allows Units of Measure and Elevation to be chosen. Simultaneously press the CALIBRATE keys to enter the menu.

#13 DO Units Simultaneously press the CALIBRATE keys to enter the menu.

#14% SAT, mg/liter or mBar units choice. Press the Up CALIBRATE key to scroll to % SAT

#15 % SAT choice. Press the Up CALIBRATE key to scroll to mBar for partial Pressure measurement.

#16Accept the choice by pressing the UP or Down MENU SELECT key.

#17 Scroll down to the Elevation Enter line by pressing the MENU SELECT Down key

#18To enter the Elevation Enter line, Simultaneously press the CALIBRATE keys to enter the menu.

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#19 Adjust the elevation by scrolling the cursor to the point under the integer to be adjusted with the Horizontal CALIBRATE key.

#20Adjust the elevation by scrolling the integer with the Vertical CALIBRATE keys.

#21 Accept the choice by pressing the UP or Down MENU SELECT key.

#22Return to the Home Screen by pressing the down CALIBRATE key or…

#23 Press the MENU SELECT down key to leave the General Menu and return to the Configure and Trim Menu.

#24Press the MENU SELECT down key to move to the next menu.

#25 °C/°F & temp cal Menu allows the selection of units and provides for calibration of the temperature sensor.

#264‐20 trim/test Menu provides the ability to trim the 4 mA or 20 mA output as detected by an external controller or instrument.

#27 Return to Home Screen

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4.0 Start Up

4.1 Functional Check Before powering the instrument, verify the wiring inside the C‐22 is correct. (See section 2.5 above) Verify the DO8 sensor is properly installed in the immersion tube or flow cell and that there are no leaks.

4.2 Powering up the Instrument Supply power to the C‐22. The instrument will initialize, run instrument diagnostics, sensor diagnostics and display the Dissolved Oxygen value.

4.3 Calibration The Triton DO8 sensor was calibrated at the factory prior to shipment and should not require a re‐calibration at start up. Calibration is required whenever the Fluorescence cap is replaced. Calibrations can be performed as a one point (Air cal), a two point (zero point & Air cal) or a standardization.

4.3.1 Frequency of Calibration The frequency of the calibration may be dictated by Standard Operating Procedures or it can be determined using the following method.

Remove the sensor from service after one month, wipe the sensor off with a damp rag and check the output in air with a % saturation measurement, it should read 100 ± 4%. If the sensor reads correctly then put it back in service and allow it to run 2 months before repeating the saturation test. If the sensor fails the calibration test then calibrate the sensors monthly, if not then test after another month.

4.3.2 Zero Point Calibration The zero point of the sensor is relatively stable through the life of the fluorescence cap. The zero point is checked by placing the sensor into an oxygen free solution and verifying the displayed value drops to a value near zero ppm. The sensor will take a few minutes to equilibrate to the zero oxygen solution but it is best to wait 15‐20 minutes before initiating a calibration (up to a 10 minute cycle time) for the highest accuracy. A zero ppm O2 solution can be made by adding approximately 5 grams of sodium sulfite to a liter of distilled water.

4.3.3 Air Calibration Air saturated water and water saturated air (100% humidity) have the same oxygen partial pressure. The preferred calibration method uses water saturated air. The Protective Guard can be removed from the front of the sensor and replaced with the easy to use Calibration Cap (an optional accessory P/N 1000227).

The calibration cycle takes up to 10 minutes once initiated. The DO8 sensor should be equilibrated for 10‐15 minutes to the air sample (100% humidity, 0% Salinity) and the ambient temperature before starting the calibration. When measuring “% Saturation” enter 100% as the calibration value.

When measuring mg/L, mg/L = ppm, the correct value must be determined. The concentration in mg/L (C) is equal to the Saturation value at the given temperature multiplied by the altitude and air pressure

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corrections. Determine the calibration temperature and look up the saturation value (S) in Table 2 below. Then determine the altitude correction (K) from Table 3 and the current air pressure in bar (P), 1 bar equals 14.7 psi. Use 1 bar if the actual air pressure is unknown.

C = S x K x P

Example:

Temperature = 20°C → Saturation = 9.08 mg/L, Altitude = 1200 ft → K = 0.960, Air Pressure 1.014 bar

C = 9.08 x 0.960 x 1.014 = 8.84 mg/L

Enter 8.84 ppm as the calibration value.

Table 2 Saturation Index

Temperature °C (°F)

Saturation mg/L


Saturation mg/L


Saturation mg/L

0 (32) 14.64 14 (57) 10.28 28 (82) 7.82 1 (34) 14.23 15 (59) 10.06 29 (84) 7.69 2 (36) 13.83 16 (61) 9.85 30 (86) 7.55 3 (38) 13.45 17 (63) 9.64 31 (88) 7.42 4 (39) 13.09 18 (64) 9.45 32 (90) 7.30 5 (41) 12.75 19 (66) 9.26 33 (91) 7.18 6 (43) 12.42 20 (68) 9.08 34 (93) 7.06 7 (45) 12.11 21 (70) 8.90 35 (95) 6.94 8 (46) 11.81 22 (72) 8.73 36 (97) 6.83 9 (48) 11.53 23 (73) 8.57 37 (99) 6.72 10 (50) 11.25 24 (75) 8.41 38 (100) 6.61 11 (52) 10.99 25 (77) 8.25 39 (102) 6.51 12 (54) 10.75 26 (79) 8.11 40 (104) 6.41 13 (55) 10.51 27 (81) 7.96

Table 3 Altitude Correction

Altitude m (ft)

K Altitudem (ft)

K Altitudem (ft)

K

Sea Level 0 1.000 700 (2300) 0.922 1400 (4600) 0.849 50 (160) 0.994 750 (2450) 0.916 1450 (4750) 0.844 100 (330) 0.988 800 (2600) 0.911 1500 (4900) 0.839 150 (500) 0.982 850 (2800) 0.905 1550 (5100) 0.834 200 (660) 0.977 900 (2950) 0.900 1600 (5250) 0.830 250 (820) 0.971 950 (3100) 0.895 1650 (5400) 0.825 300 (980) 0.966 1000 (3300) 0.890 1700 (5600) 0.820 350 (1200) 0.960 1050 (3450) 0.885 1750 (5750) 0.815 400 (1300) 0.954 1100 (3600) 0.879 1800 (5900) 0.810 450 (1500) 0.949 1150 (3775) 0.874 1850 (6050) 0.805 500 (1650) 0.943 1200 (3950) 0.869 1900 (6200) 0.801 550 (1800) 0.938 1250 (4100) 0.864 1950 (6375) 0.796 600 (2000) 0.932 1300 (4250) 0.859 2000 (6550) 0.792 650 (2150) 0.927 1350 (4400) 0.854

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4.3.4 Standardization, a Referenced Cal The Standardization of the sensor to a known value, possibly a grab sample, is performed just like an Air Calibration except the calibration value is not entered from the 100% saturation Index Tables, it is user specified.

4.3.5 Calibration Screens #1 Home Screen Press the Down MENU SELECT key to move to the Channel #1 screen. (PV1)

#2Channel #1 screen Press the Down MENU SELECT key to move to the Plot screen.

#3 Plot screen Press the Down MENU SELECT key to move to the Parameter Selection Screen.

#4In the Parameter Selection Screen enter the Ch1 Buffer screen by simultaneously pressing the horizontal CALIBRATE keys.

#5 1 DO, (Zero Point Calibration) Optional due to minimal Zero point Drift. Place sensor in 0 ppm solution then simultaneously press the CALIBRATE keys.

#6The cursor will move under the .00 mg/l. Accept the value by pressing the Down MENU SELECT key.

#7 Move the cursor to the Calibrate line by pressing the down MENU SELECT key.

#8Initiate the calibration by simultaneously pressing the CALIBRATE keys.

#9 Sensor Calibrating Screen The Analyzer returns to the Home screen and the message line acknowledges the calibration. This process takes from 60 ‐ 600 sec.

#10Proceed to the Air Calibration or Standardization Screen by pressing the Down MENU SELECT key.

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#11 Channel #1 screen Press the Down MENU SELECT key to move to the Plot screen.

#12Plot screen Press the Down MENU SELECT key to move to the Parameter Selection Screen.

#13 In the Parameter Selection Screen enter the Ch1 Buffer screen by simultaneously pressing the horizontal CALIBRATE keys.

#14Scroll down through the 1 DO (Zero Calibration) line using the MENU SELECT key.

#15 Scroll down through the Calibrate line using the MENU SELECT key.

#16Enter the 2 DO line, (Air Calibration or Standardization) by simultaneously pressing the CALIBRATE keys.


#18Adjust the mg/l to the level determined in section 4.3.3 (above) or to the standardization value with the vertical CALIBRATE key.


#20Adjust the value with the vertical CALIBRATE key.

#21 Accept the value by pressing the Down MENU SELECT key.

#22Move the cursor to the Calibrate line by pressing the down MENU SELECT key.

Triton DO8

#23 Initiate the calibration by simultaneously pressing the CALIBRATE keys.

#24The Analyzer returns to the Home screen and the message line acknowledges the calibration. This process takes from 60 ‐ 600 sec.

#25 The Calibrating message disappears when the calibration is complete. The sensor is calibrated and the values are stored in the sensor.

Triton DO8 Page 19

5.0 Maintenance The Triton DO8 sensor should receive maintenance on a regular basis. The maintenance interval should be determined empirically as it will depend on the installation conditions and the nature of the media being measured. The interval should be no greater than every two months.

5.1 Maintenance Procedure The typical procedure would include;

• Cleaning the sensor (See section 5.2) • Check the measuring function:

o Remove the sensor from the medium. o Clean and dry the sensor/membrane. o After about 10 minutes in air, measure the oxygen saturation index (without

recalibration). o The measured value should be at 100 ± 4 % SAT

• If necessary, replace a defective membrane or one which cannot be cleaned any more. • Recalibration, if necessary.

5.2 Cleaning the Sensor The fluorescence cap of the Triton DO8 sensor must be clean to ensure an accurate measurement. The measurement will degrade as the fluorescence cap gets coated. Build‐up of material on the cap will increase the response time and decrease the slope. The sensor should be cleaned on a regular basis and before every calibration.

*** Do Not Scrub the Sensing Portion of the Cap with any abrasive material, use only a soft sponge or cloth and water to clean the tip***

The cleaning method depends on the nature of the coating. For insoluble mineral or salt deposits, the sensor should be soaked in a 1‐5 % solution of HCl, hydrochloric acid, for no more than 10 minutes. After this acid treatment rinse the sensor with copious amounts of tap water and then allow it to soak in the tap water for at least 5 minutes before evaluating the performance. Repeat if necessary.

For biological films or dirt, rinse the tip with tap water and gently wipe the sensing surface with a soft sponge or cloth.

5.2.1 Cleaning the Internal Optics The internal optical surface should only need cleaning if the Fluorescence Cap is broken or defective. The following steps should be followed in the case of a leaking cap.

1. Unscrew the protective guard and the fluorescence cap from the sensor head.

2. Carefully clean the optical surface with a soft cloth and water until the buildup is fully removed.

3. Use only drinking or distilled water to clean the optics, do not scratch the optical surface.

4. Dry the optics with a soft lint free cloth and screw on a new fluorescence cap.

Triton DO8

5.3 Replacing the Fluorescence Cap The Fluorescence Cap (P/N 2500207) can provide up to two years service, if damaged or when it expires, it is easily replaced.

5.3.1 Removing the Old Fluorescence Cap • Remove the sensor from the medium.

• Unscrew the protection guard.

• Clean the outside of the sensor.

• Unscrew the fluorescence cap.

• Clean and dry the optical surface if necessary.

5.3.2 Installing the New Fluorescence Cap • Make sure that there are no dirt particles on the sealing surface.

• Visually inspect the sealing o‐ring, replace if necessary. (P/N 1000225)

• Carefully screw the fluorescence cap onto the sensor head until the stop.

• Screw the protection guard back on.

*** After replacing the Fluorescence Cap the sensor must be calibrated. *** (See section 3.3)

5.4 Air Blast Spray Head Cleaner The Air Blast Spray Cleaning head is an optional accessory that allows the sensor to be cleaned in situ. The turbulence caused by the injection of high pressure air into the water near the optically active end of the sensor removes most of the bio‐films and dirt that accumulate on the sensing tip.

The Air Blast Spray Cleaner is tapped with a ¼” FNPT port that will accept standard tube fittings. The air supply, tubing and fittings are not included with the spray head and must be supplied by the user.

Triton DO8 Page 21

6.0 Troubleshooting

6.1 Symptom/Remedy Guide Problem Possible Cause Remedy Blank or No display, Proper voltage to the transmitter?

Sensor connected correctly?

Verify power source Connect per Section 2.5, above

Unchanging reading No flow at sample point. Buildup on the fluorescence cap?

Create Flow Clean Cap, (see section 5.2)

Displayed value too high Displayed Temperature clearly too low?

Check sensor, if necessary send sensor in for repair.

Displayed value too low Bad Calibration? Inadequate flow, unrepresentative sample? Displayed temperature clearly too high? Buildup on the fluorescence cap?

Clean and recalibrate the sensor. Create flow. Check sensor, if necessary send sensor in for repair. Clean cap, Replace if necessary

Noisy erratic Readings Fluorescence cap worn out? Electrical Interferences

Replace Fluorescence cap Verify wiring (see section 2.5) Shield the cable from external high voltage

6.2 Sensor Checks Check Action Value Voltage inspection With the sensor connected, test the

operating voltage on the C‐22 transmitter Between terminals 1 and 2, +8 V Between terminals 3 and 2, ‐8 V

Slope inspection Place the cleaned and dried sensor in the air After 10 minutes the reading should be 100 +/‐ 4 % saturation.

Zero point inspection Immerse the sensor in zero solution. After several minutes the sensor should read near 0 mg/l (0% Sat).

Triton DO8

7.0 Product Specifications Measurement Range

0 ‐ 20 mg/l (0 ‐ 20 ppm)

0 ‐ 200 % Saturation

0 ‐ 400 mbar (0 ‐ 6 psi)

Pressure Range

Maximum Pressure 10 bar (159 psi)

Temperature Range

‐5° ‐ 50°C (20° ‐ 120°F) Measuring

‐20° ‐ 60°C (0° ‐ 140°F) Ambient

Response Time

T90 = 60 sec

Accuracy

Max. Error < 2 % of measured range

Repeatability

±0.5 % of measured range

Resolution

0.01 ppm or 0.01 % Saturation

Operating Lifetime of Sensor Cap

Up to 2 years in recommended service, typically > 1 year (protect against direct sunlight)

Wetted Materials

316 SS, POM, Silicone

Sensor Cable

Shielded 7 core cable

7 meter (23 ft) or 15 meter (49 ft) lengths

Process Connection

G1 Thread (¾” FNPT adapter available)

Maximum Cable Length

100 m maximum from C‐22 controller

Dimensions

Length 8.7” (220 mm)

Diameter 1.6” (40 mm)

Weights

Cable length 7 m (23 ft): 0.7 kg (1.5 lbs)

Cable length 15 m (49 ft): 1.1 kg (2.4 lbs)

Triton DO8 Page 23

8.0 Spare Parts and Accessories

8.1 Exploded View

8.2 Sensor and Analyzers Part # Description 1397000‐1 Triton Series DO8 Optical Dissolved Oxygen Sensor with 7 meter cable 1397001‐1 Triton Series DO8 Optical Dissolved Oxygen Sensor with 15 meter cable

16F01221.F000 C‐22 Single Channel Optical Analyzer/Controller, (1) 4‐20 mA output, (2) Form C SPDT relays

16FF2421.FF00 C‐22 Dual Channel Optical Analyzer/Controller, (2) 4‐20 mA outputs, (4) Form C SPDT relays

8.3 Accessories Part # Description 2500207 Replacement Sensor Cap (Optically Active Component)

1000225 Set of (2) sealing o‐rings used with Sensor Cap

1000224 G1 to ¾” FNPT adapter kit, changes G1 rear facing male thread to female socket

1000223 Immersion Assembly (G1 adapter, Cap/Cable feed‐through, 1 meter down pipe)

2000263 Rail Mounting Brackets, (2) Quick Release “U” clamps for 2” Guard Rail mounting

1000219 Flow Through Housing

9640028 7 Conductor Cable, per meter

1000222 NEMA 4X Junction Box, (2) cable glands, terminal strip, PVC box, 6”x3”x2”, LWD

1000226 Air Blast Spray Cleaner, includes spray head, ¼ Tube fittings

Figure 8

1. Sensor Body

2. Sealing O‐Ring PN 1000225

3. Fluorescence Cap PN 2500207

4. Protective Cap

Triton DO8

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