
Specs at a glance
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Measurement range
k=1: 10 µS/cm to 20 mS/cm
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Process temperature
-20 to 135 °C at 3.5 bar abs
(-4 to 275 °F at 50 psi) -
Process pressure
17 bar abs at 20 °C
(246 psi at 68 °F)
Field of application
Condumax CLS21D 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. Condumax CLS21D is not the latest Memosens generation. To get information on the new Memosens CLS21E sensor with extended functionality, click here.
Condumax CLS21D 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, FM, CSA and NEPSI, the digital sensor is suitable for hazardous area use.
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
Logging of sensor-specific data for easy traceability and predictive maintenance
Maximum process safety via non-contact inductive signal transmission
Videos
Extended selection
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High-end products
- Highly functional and convenient
Technical excellence
Simplicity

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Standard products
- Reliable, robust and low-maintenance
Technical excellence
Simplicity
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Specialized products
- Designed for demanding applications
Technical excellence
Simplicity
Variable
FLEX selections | Technical excellence | Simplicity |
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Fundamental selection Meet your basic measurement needs |
Technical excellence
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Simplicity
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Lean selection Handle your core processes easily |
Technical excellence
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Simplicity
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Extended selection Optimize your processes with innovative technologies |
Technical excellence
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Simplicity
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Xpert selection Master your most challenging applications |
Technical excellence
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Simplicity
Variable |
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Technical Information (TI)
Condumax CLS21D/CLS21 Technische Information
German version - 01/2018
Leitfähigkeitssensoren, analog oder digital mit Memosens-Technologie
EN 31/01/201831/10/201410/09/201201/04/201001/10/2007Language:
German
Version:
31/01/2018
File size:
901.9 KB
File name:
TI00085CDE_1518.pdf
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Operating Instruction (BA)
Condumax CLS15D/16D/21D
German version - 06/2022
Konduktive Leitfähigkeitsmessung in Flüssigkeiten
EN 01/06/202219/08/202027/01/202010/10/201731/07/2016Language:
German
Version:
01/06/2022
File size:
1.5 MB
File name:
BA01147CDE_0722-00.pdf
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Technical Information (TI)
Technical Information for Conductivity Sensor
Conductivity Sensor
EN 25/03/201118/03/201118/08/201018/05/201018/12/2008Language:
Japanese
Version:
25/03/2011
File size:
2.2 MB
File name:
Ti803cja_0311.pdf
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Technical Information (TI)
Condumax CLS21D/CLS21 Technical Information
Conductivity sensors, analogor digital with Memosens technology
EN 31/01/201831/10/201410/09/201201/04/201001/10/2007Language:
English
Version:
31/01/2018
File size:
898.9 KB
File name:
TI00085CEN_1518.pdf
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Operating Instruction (BA)
Condumax CLS15D/16D/21D
For contacting conductivity measurement in liquids
EN 01/06/202219/08/202027/01/202010/10/201731/07/2016Language:
English
Version:
01/06/2022
File size:
1.5 MB
File name:
BA01147CEN_0722-00.pdf
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Ex Safety Instruction (XA)
CLS50D, CLS50, CLS54, CLS15D, CLS16D, CLS21D, CLS82D
Supplement to: BA00182C, BA01591C, BA01147C, BA01326C Safety instructions for electrical apparatus in explosion-hazardous areas UK II 1G Ex ia IIC T3/T4/T6 Ga
EN 31/01/202220/10/2021Language:
English
Version:
31/01/2022
File size:
459.6 KB
File name:
XA02702CEN_0222-00.pdf
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Ex Safety Instruction (XA)
Safety instructions Condumax CLS15D, CLS16D, CLS21D
Safety instructions for electrical apparatus for explosion-hazardous zone 2
EN 02/09/200901/04/2009Language:
English
Version:
02/09/2009
File size:
1.4 MB
File name:
XA227CA3_0909.pdf
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Ex Safety Instruction (XA)
Safety instructions Condumax CLS15D, CLS16D, CLS21D
Safety instructions for electrical apparatus for explosion-hazardous areas
EN 02/09/200901/07/2008Language:
English
Version:
02/09/2009
File size:
1.3 MB
File name:
XA085CA3_0909.pdf
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Ex Safety Instruction (XA)
CLS15D, CLS16D, CLS21D, CLS50D, CLS50, CLS54, CLS82D
Safety instructions for electrical equipment in explosion-hazardous areas EAC Ex, 0Ex ia IIC T6/T4 Ga X Supplement to: BA01147C,BA00182C, BA01591C, BA01326C
EN 01/03/202231/03/2021Language:
English
Version:
01/03/2022
File size:
507 KB
File name:
XA02375CEN_0222-00.pdf
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Special Documentation (SD)
Memoclip
Äußere Kennzeichnung von digitalen Sensoren und Kabeln mit Memosens-Technologie
EN 01/03/2007Language:
English
Version:
01/03/2007
File size:
284.4 KB
File name:
SD124Ca2.pdf
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Fields of Activities (FA)
Esperti nell’analisi dei liquidi
Dai sensori singoli a soluzioni complete “chiavi in mano”
Language:
Italian
Version:
12/01/2017
File size:
3.9 MB
File name:
FA01018CIT_02.16.pdf
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Fields of Activities (FA)
Catálogo Portfolio Analítica
Desde sensores hasta soluciones completas
Language:
Spanish
Version:
12/01/2017
File size:
1.5 MB
File name:
FA01018CES_Portfolio_Analitica_0216.pdf
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Fields of Activities (FA)
Jistota v analýze kapalin
Od senzorů po kompletní dodávku na klíč
Language:
Czech
Version:
12/01/2017
File size:
740.3 KB
File name:
Analyza_FA01018Ccs_0216.pdf
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Competence Brochure (CP)
Aus Freude an gutem Wasser
Frische Ideen für Wasserwerke, Verteilernetze,Oberflächenwasser und Industrieanlagen
Language:
German
Version:
17/06/2020
File size:
3.2 MB
File name:
CP01335CDE_0119_Kompetenz in Wasser.pdf
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Competence Brochure (CP)
Leitfähigkeitsmessung in Industrieprozessen
Auswahl- und Engineeringhilfefür verschiedene Industrien und Anwendungen
Language:
German
Version:
05/12/2019
File size:
2.9 MB
File name:
CP01313CDE_0119_LF Auswahlhilfe.pdf
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Competence Brochure (CP)
For the love of quality water
Fresh ideas for waterworks, distribution networks, surface waters and industrial plants.
Language:
English
Version:
17/06/2019
File size:
3.2 MB
File name:
CP01335CEN_0119_Competence in water.pdf
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Competence Brochure (CP)
Conductivity measurement in industrial processes
Selection and engineering guide for different industries and applications
Language:
English
Version:
05/12/2019
File size:
3 MB
File name:
CP01313CEN_0119_cond_selection guide.pdf
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Case Study (CS)
Conductivity measurement in a water reuse plant
Conductivity measurement in a water reuse plant: Precise measured values even in low measuring ranges
Language:
English
Version:
22/10/2019
File size:
2 MB
File name:
CS01607C_CLS82D in water reuse plant_Pasfrostpdf.pdf
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Case Study (CS)
Liquiline M CM42 and CLS21D measure conductivity - Chemical
Liquiline M CM42 and CLS21D with Memosens measure the conductivity in process water pipes to detect contaminants
Language:
English
Version:
30/06/2010
File size:
1.3 MB
File name:
CS0361 CM42 and CLS21D in water pipes.pdf
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Case Study (CS)
Mesure de conductivité dans une installation de réutilisation des eaux
Valeurs mesurées précises même dans des gammes de mesure aux valeurs basses
Language:
French
Version:
22/10/2019
File size:
1.2 MB
File name:
CS01607CFR-0119-Pasfrostpdf.pdf
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Case Study (CS)
Leitfähigkeitsmessung in Wasserrecyclingsanlage
Leitfähigkeitsmessung in Wasserrecyclingsanlage: Präzise Messwerte auch in niedrigen Messbereichen
Language:
German
Version:
22/10/2019
File size:
2 MB
File name:
CS01607C_CLS82D in Wasserrecyclingsanlage_Pasfrost.pdf
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AI (Application note)
Liquid analysis in LNG trains
Complete solution out of one hand
Language:
English
Version:
08/01/2021
File size:
523.8 KB
File name:
AI01150CEN_01.21_Liquid analysis in LNG trains.pdf
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