SE 655(X) / SE 656(X)Toroidal Conductivity Sensors

User ManualEnglish

Latest Product Information: www.knick.de

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The SE 655(X) and SE 656(X) toroidal conductivity sensors are particularly suited for applications in the chem-ical industry and for process analysis. Thanks to the large measuring range over six decades and the high chemical resistance of the process-wetted parts made of PEEK or PFA, resp., almost every conceivable applica-tion is possible, such as concentration determination of acids, bases and salt solutions, monitoring of product quality or phase separation of product mixtures. The SE 655X and SE 656X sensors are approved for operation in hazardous locations.

Special conditions for safe use in hazardous areas• The sensors may only be used in liquid media with a conductivity of > 10 nS/cm

(risk of electrostatic charging of the sensor).• The sensors are suitable for use in the following ambient/process temperature ranges:

Temperature class T4: -20 ... +125 °C Temperature class T6: -20 ... +75 °C

• The measuring cable must be protected from electrostatic charging when applied in Ex Zone 0 (1G).• Metallic process connection parts must be mounted at the installation site so that they are electrostatically

conductive (< 1 Mohm).

Safety Information• Application in hazardous locations: Observe the EC-Type-Examination Certificate and the provisions

of the current EN 60079-14 (Electrical installations in hazardous areas) when installing the product.• Manipulations of the product other than described in the user manual are not permitted.• Assembly/dismantling, installation, operation and maintenance shall only be carried out by qualified

personnel as defined by the automation industry in compliance with the applicable regulations and this user manual. Be sure to observe the specified ambient conditions and installation instructions.

• The sensors were developed in compliance with the applicable European guidelines and standards. The models SE 655X and SE 656X are suitable for use in hazardous locations. Compliance with the European Harmonized Standards for use in hazardous locations is confirmed by the EC Declaration of Conformity (see page 12).

• Be sure to follow the instructions given in this user manual for connecting and operating the SE 655(X) and SE 656(X) sensors.

• Observe the specified ambient conditions and temperature ranges to ensure the safe operation of the sensors.

• Take care to maintain the IP 68 protection when installing the sensor (use original gasket, pay particular attention to the cable connections).

• Make sure that the gaskets are securely in place. Otherwise, the assembly is not tight.• Do not dismantle the sensor as long as the process medium is under pressure.• For applications in aggressive media such as highly concentrated acids or bases, use the SE 656(X)

sensor with sealing sets B or C (ZU 0340N or ZU 0342N) made of particularly resistant material (PTFE).

Description

4 Table of Contents

Description ................................................................................................3

Safety Information ...................................................................................3

Table of Contents ......................................................................................4

Specifications ...........................................................................................5Chemical resistance ...................................................................................................6Temperature and pressure resistance .................................................................6Electrical connection .................................................................................................7Identification of the sensors ...................................................................................7

Assembly ...................................................................................................8Assembly, with PTFE washer (for flange protection) ....................................8Assembly, without PTFE washer (flange wetted by process medium) ..8

Dimension Drawings ..............................................................................10

Dimension Drawings of Flange .............................................................11

EC Declaration of Conformity ................................................................12

EC-Type-Examination Certificate ..........................................................13

Accessories ..............................................................................................18

5Specifications

General

Cell factor Approx. 2 (for installation conditions, see Fig. 10 Minimum extent of the free field without change of the cell factor, page 9)

Transfer ratio 120.0

Sensor coding F003

Measuring range 0 ... 2000 mS/cm

Resolution 0001 mS/cm

Accuracy (-20 ... +100 °C) ± (0.005 mS/cm + 0.5 % meas. value)

Accuracy (> 100 °C) ± (0.010 mS/cm + 0.5 % meas. value)

MaterialSE 655(X) SE 656(X)

PEEKPFA

Process temperatureSafe areaEx T4Ex T6

-20 ... +125 °C -20 ... +125 °C -20 ... +75 °C

Temperature response time t90 (DIN 746-1)

SE 655(X)SE 656(X)

Approx. 7 minApprox. 11 min(For measuring processes with rapid temperature changes, use a separate temperature detector with fast response.)

Ambient temperature -20 ... +70 °C

Storage temperature -20 ... +80 °C

Process pressureSE 655(X)SE 656(X)

0 ... 20 bar0 ... 16 bar

Temperature detector Pt 100, Class A (IEC 751)

Assembly G 3/4

CableLength

Connection

5 m (max. permissible cable length for hazardous-area applications: 55 m)Wire end ferrules

Protection (EN 60529) IP 68 (sensor mounted, with original gasket)

Explosion protectionSE 655X/SE 656X

II 1G Ex ia IIC T4/T6 Ga

Weight Approx. 1 kg

6

20

16

-20 125

16

-20 20 125

9

1,5

P/T diagram (sensor version)

P/T diagram (flange version)

Fig. 2 Pressure/temperature curves for the different flanges

Pres

sure

[bar

]

Temperature [°C]

Temperature [°C]

Pres

sure

[bar

]

SE 655(X), PEEK

SE 656(X), PFA

DN 50, stainless steel (ZU 0343)

DN 50, PVDF (ZU 0344)

Fig. 1 Pressure/temperature curves for the different sensor materials

Temperature and pressure resistance

Specifications

Chemical resistance

Medium Concentration [%]

Temperature[°C]

Resistance PFA / PEEK

Nitric acidHNO3

5 2060

++

++

up to 40 2060

++

+-

Phosphoric acidH3PO4

up to 10 2060

++

++

Sodium hydroxide solution

NaOH3

205080

+++

+++

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Connect the sensor to you measuring device. Refer to the user manual of your measuring device for information on the electrical connection. For further information, see www.knick.de.

Electrical connection

Identification of the sensors

Safe-area model Hazardous-area model

Fig. 4 Model designation / rating plates of SE 655(X) sensors

Safe-area model Hazardous-area model

Fig. 5 Model designation / rating plates of SE 656(X) sensors

Coax RD

Coax WH

BU

BU

RD

RD

GN

WH

YE

GY

receive hi

receive lo

send lo

send hi

RTD (temp)

RTD (temp)

sense (temp)

shieldFig. 3 Wire assignment of measuring cable

Specifications

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Assembly, with PTFE washer (for flange protection)Max. torque 20 Nm, 36-mm wrench

Fig. 6 Assembly, with PTFE washer

Fig. 7 Assembly, without PTFE washer

Nut (included with sensor) Replacement: ZU 0341 N

ZU 0343 flange

ZU 0342N: PTFE washer DN 50

O-ring (included with sensor)Replacement: ZU 0341N

Nut

Flange (stainless steel) DN 50 PN 16

Gasket

Sensor

Flange kit DN 50 PVDF PN 10

Lapped flange (UP-GF)NutFlange (PVDF)

Sensor: PFA

Assembly, without PTFE washer (flange wetted by process medium)Max. torque 20 Nm, 36-mm wrench

Assembly

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1,40

1,20

1,00

0,800 10 30 50

am

ax 1

00

Min. distance 30 mm (no change of cell factor)With a distance of less than 30 mm to metallic tank or pipe walls, the cell factor will be reduced. With insulating walls, the cell factor will increase.

Make sure that the sensor is correctly positioned.

Minimum water level in the pipe(sensor head completely wetted)

Distance a to pipe wall [mm]

Fig. 10 Minimum extent of the free field without change of the cell factor

Fig. 8 Minimum extent of the free field without change of the cell factor

Fig. 9 Typical installation in a pipe

Insulating pipe wall

Conducting pipe wall

Installation factor

Assembly

10

Fig.11 Dimensions of the sensor [mm]

Dimension Drawings

Ø 24

Ø 39

Ø 47

Ø 15.5

27.5

G 3/4

36 A

/F 9814

8 / 1

51

11

Flange kit DN 50 PN 10, PVDF, ZU 0344

Flange kit DN 50 PN 16, 316L, ZU 0343

Fig. 12 Dimensions of the flanges [mm]

Lapped flange Flange (PVDF)

4 x 18

18

78125165

4 x 18

18

125165

27

2011

75102

27

Flange (stainless steel)

Dimension Drawings of Flange

12 EC Declaration of Conformity

13EC-Type-Examination Certificate

14 EC-Type-Examination Certificate

15EC-Type-Examination Certificate

16 EC-Type-Examination Certificate

17EC-Type-Examination Certificate

18 Accessories

Order No.

Flange DN 50 PN 16 Material: 316 L (When using the SE 656(X) sensor or measuring in aggressive media, you require sealing set C.)

ZU 0343

Flange DN 50 PN 10 Material: PVDF ZU 0344Sealing set A spare part for SE 655(X)

Nut + FKM (Viton) O-ring (3 x) ZU 0340N

Sealing set B spare part for SE 656(X)

Nut + FFKM (Chemraz) O-ring (2 x) ZU 0341N

Sealing set C PTFE washer DN 50(protects ZU 0343 flange against aggressive media)

ZU 0342N

Conductivity standard KCl 0.1 mol/l 250 ml 12.88 mS/cm + 1.5% ZU 0348

For more accessories enabling the installation in immersion fittings or flow-through fittings, refer to the Knick “Process Analytics” catalog.

For your notes:

Knick Elektronische Messgeräte GmbH & Co. KGBeuckestr. 2214163 Berlin

Tel: +49 (0)30 - 801 91 - 0Fax: +49 (0)30 - 801 91 - 200Internet: http://www.knick.deknick@knick.de

TA-163.350-KNE06 08729020131211