Analog conductivity sensor
Condumax CLS21

The conductivity of a liquid can be measured using the conductive or toroidal measuring principles. This video shows what it is about and how these measuring principles work.

Conductive conductivity sensor for medium to high measuring ranges

Condumax CLS21 is a robust conductivity sensor for all process and environmental applications. It provides you with precise and reliable measuring values for an optimum process and product quality monitoring. Better still, the sensor features high chemical, thermal and mechanical stability and high durability.

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Benefits
Reliable and accurate measuring values at medium to high conductivities
Robust design for long durability and low maintenance
High chemical, thermal and mechanical stability
Quality certificate stating the individual cell constant

Field of application
Condumax CLS21 measures conductivity in all process and environmental applications, such as:

Potable water treatment

Desalination plants

Industrial water treatment

River/lake monitoring

Phase separation in medium conductivities (e.g. milk/water)

With...

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Condumax CLS21 measures conductivity in all process and environmental applications, such as:

Potable water treatment

Desalination plants

Industrial water treatment

River/lake monitoring

Phase separation in medium conductivities (e.g. milk/water)

With its international explosion protection approvals, such as ATEX and FM, the sensor is suitable for hazardous area use.

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Features and specifications

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Details

Measuring principle

Conductive
Application

Water, waste water, process, media separation, industrial water.
Characteristic

2-electrode system for application in the middle application range.
Measurement range

k=1: 10,0 µS/cm - 20,0 mS/cm
Measuring principle

Conductive conductivity cell with graphite electrodes for applications in the middle range.
Design

2-electrode system with parallel arranged electrodes
Material

Cell shaft: PES
Electrodes: graphite
Dimension

Diameter: 24 mm
(0.936 inch)
Length: 61 mm
2.37 inch)
Process temperature

max. 135°C
(max. 275°F)
Process pressure

max. 16 bar at 20°С
(max. 232psi at 68°F)
Temperature sensor

Optional with integrated Pt100 or PTC temperature sensor.
Ex certification

ATEX
Connection

Process connection: DN25, DN40, G1", Cable: 4-pole connector with thread Pg9 or fixed cable.
Ingres protection

IP65 (connector)IP67 (fixed cable)

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Documents / Manuals / Software

Download type

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Condumax CLS21D/CLS21 Technical Information
Conductivity sensors, analog or digital with Memosens technology

Technical Information (TI)
Condumax CLS15/16/21
For conductive measurement of conductivity in liquids

Operating Instruction (BA)
Ex Safety Instructions CLS XX
Sicherheitshinweise für explosionsgefährdete Bereiche.
Safety instructions for hazardous areas.
Conseils de sécurité pour zones explosibles.

Ex Safety Instructions (XA)
Ex Safety Instructions CLS XXG
Sensors for conductive Conductivity Measurement

Ex Safety Instructions (XA)
Conductivity measurement in industrial processes
Selection and engineering guide for different industries and
applications

Competence Brochure (CP)

12/19

English
Leitfähigkeitsmessung in Industrieprozessen
Auswahl- und Engineeringhilfe für verschiedene Industrien und
Anwendungen

Competence Brochure (CP)

12/19

German
Condumax W CLS21
Leitfähigkeitsmesszelle konduktiv mit Pt 100 Temperaturfühler

Tender Text

12/16

German
Measurement of electrical conductivity (.mp4 format, 70,7MB)
The conductivity of a liquid can be measured using the conductive or
toroidal measuring principles. This video shows what it is about and how
these measuring principles work.

Animation

01/14

fr
Measurement of electrical conductivity (.mp4 format, 116 MB)
The conductivity of a liquid can be measured using the conductive or
toroidal measuring principles. This video shows what it is about and how
these measuring principles work.

Animation

01/14

Polish
ConduMax H, ConduMax W
Product Code: CLS12-, CLS13-, CLS15-, CLS16-, CLS21-
Declaration Number: EC_00317_02.16

EU Declaration

German , English , fr
ConduMax H, ConduMax W
Product Code: CLS12-, CLS13-, CLS15-, CLS16-, CLS21-
Declaration Number: EC_00317_01.16

EU Declaration

German , English , fr
ConduMax H, ConduMax W, InduMax H, InduMax P, Liquisys Conductivity, Memosens, SmarTec, SmarTec S
Product Code: CLS82D-, CLS54D-, CLS54-, CLS50D-, CLS50-, CLS30-, CLS21D-, CLS21-, CLS19-, CLS16D-, CLS16-, CLS15D-, CLS15-, CLS13-, CLS12-, CLM253-, CLM223F-, CLM223-, CLD18-, CLD134-, CLD132-
Approval Number: EAEC RU D-DE.AD.07.B.01362/19

Miscellaneous

Russian
SmarTec S, SmarTec, Sensor, Memosens, Liquisys Conductivity, Liquiline, InduMax P, InduMax H, ConduMax W, ConduMax H, Chloromax, ANALOG
Product Code: CLM253-, CLS12-, CLS13-, CLS15-, CLS15D-, CLS16-, CLS16D-, CLS19-, CLS21-, CLS21D-, CLS30-, CLS50-, CLS50D-, CLS54-, CLS54D-, CLS82D-, CYM290-, CLM223F-, CLM223-, CLD18-, CLD134-, CLD132-, CCS55D-, CCS51D-, CCS51-, CCS50D-, CCS50-, CCS241-, CCS240-, CCS142D-, CCS141-, CCS140-, CCS120D-, CCS120-
Region/Country: Russia (Declaration of Conformity)
Approval Number: EAEC RU D-DE.AD07.B.01363/19

Miscellaneous

Russian
ConduMax H, ConduMax W
Product Code: CLS12-, CLS13-, CLS15-, CLS16-, CLS21-, OLS21-
Region/Country: China
Approval Agency: NEPSI

Explosion Protection

Chinese
TopHit, Sensor, OrbiSint, OrbiPore, OrbiPac, Memocheck, InduMax P, InduMax H, ConduMax W, ConduMax H, CeraLiquid, CeraGel
Product Code: CYP03D-, CTS1-, CPS92-, CPS91-, CPS72-, CPS71-, CPS491-, CPS471-, CPS441-, CPS42-, CPS41-, CPS13-, CPS12-, CPS11-, CPF82-, CPF81-, CLS54-, CLS50-, CLS21-, CLS16-, CLS15-, CLS13-, CLS12-
Region/Country: Canada
Approval Agency: CSA

Explosion Protection

English
ConduMax H, ConduMax W
Product Code: CLS12-, CLS13-, CLS15-, CLS16-, CLS21-
Region/Country: Brazil
Approval Agency: TÜV
Protection: Ex ia IIC T3 Ga, Ex ia IIC T4 Ga, Ex ia IIC T6 Ga

Explosion Protection

Portuguese
InduMax P, Liquiline M, Memosens
Product Code: CPS41-, CPS41D-, CPS42-, CPS42D-, CPS441-, CPS441D-, CPS471-, CPS471D-, CPS491-, CPS491D-, CPS64-, CPS71-, CPS71D-, CPS72-, CPS72D-, CPS76D-, CPS91-, CPS91D-, CPS92-, CPS92D-, CPS96D-, CTS1-, CYK10-, CYP01D-, CYP02D-, OPS171D-, CLS12-, CLS13-, CLS15-, CLS15D-, CLS16-, CLS16D-, CLS21-, CLS21D-, CLS50-, CLS50D-, CLS82D-, CM42-, COS21D-, CPS171D-, CPS16D-, CPS13-, CPS12D-, CPS12-, CPS11D-, CPS11-, CPF82D-, CPF82-, CPF81D-, CPF81-, COS51D-, COS22D-
Region/Country: USA
Approval Agency: FM

Explosion Protection

English
ConduMax W
Product Code: CLS21-, CLS21D-
Region/Country: Canada (CRN)
Approval Agency: CRN

Pressure Equipment

English
ConduMax H, ConduMax W, InduMax H, InduMax P, Liquisys Conductivity, SmarTec S
Product Code: CLS54-, CLS52-, CLS50-, CLS30-, CLS21-, CLS19-, CLS16-, CLS15-, CLS13-, CLS12-, CLM253-, CLM223-, CLD134-, CLD132-
Region/Country: Russia
Approval Agency: Rosstandart
Approval Number: DE.C.31.004.A_66843

Metrology

Russian
SmarTec, Memosens, InduMax P, OxyMax W, OxyMax H, OrbiPac, Liquiline M, InduMax H, ConduMax W, ConduMax H
Product Code: CPS96D-, CM42-, CLS50D-, COS22D-, CLS82D-, CLS54D-, COS51D-, CLS54-, CLS52-, CPS76D-, CPS16D-, CPF82D-, CPF82-, CPF81D-, CPF81-, CLS50-, CLS30-, CLS16D-, CLS21D-, CLS21-, CLS15D-, CLS15-, CLS13-, CLS12-, CLD18-
Region/Country: Russia
Approval Agency: Rosstandart
Approval Number: OC.C.31.004.A NO 55929/1

Metrology

Russian

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Accessories / Spare parts

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Order code

Specification

- Order code 50014431
  
  circuit socket GDM 3011
  
  Alte Material-Nummer: 115958
  
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- Order code 50014433
  
  sealing GDM 3-21 B.NR.731739-004
  
  Alte Material-Nummer: 115959
  
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- Order code 50015632
  
  Cond.cable 3m straight plug CLS19/21
  
  Alte Material-Nummer: 117234
  
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- Order code
  
  No spare parts available.
  
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