Specs at a glance
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Measuring 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
Memosens CLS21E is a robust conductivity sensor for all water applications with medium conductivities. It provides you with precise and reliable measured values for optimum quality monitoring. The sensor is corrosion-free and features high mechanical stability ensuring a long operating life. Thanks to Memosens 2.0 digital technology, CLS21E combines maximum process and data integrity with simple operation. It facilitates predictive maintenance and provides the perfect basis for IIoT services.
Memosens CLS21E measures conductivity in all water applications, such as:
Potable water treatment
Desalination plants
Industrial water treatment
River/lake monitoring
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 measured values at medium conductivities ensure precise monitoring of water quality.
Robust design for long durability and low maintenance: The sensor is corrosion-free and features high mechanical and chemical stability.
Quality certificate stating the individual cell constant allows accurate measurement.
Non-contact inductive signal transmission ensure maximum process and data integrity.
Memosens 2.0 technology enables the sensor to store more process and calibration data. It lays the basis for IIoT services and predictive maintenance.
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 |
|---|---|---|
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 |
Predecessor
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Manufacturer Declaration
Product family: ConduMax W, Memosens
English version - 07/2025
Product root: CLS21-, CLS21E- Declaration number: HE_02148_01.25 Manufacturer specification: Food hygiene Additional information: Japan Food contact material
Language:
English
Version:
03/07/2025
File size:
311.2 KB
File name:
HE_02148_01.25_CLS21.pdf
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Operating Instruction (BA)
BA Memosens CLS21E
Conductivity sensor with Memosens protocol
EN 20/04/2023Language:
English
Version:
20/04/2023
File size:
649 KB
File name:
BA02020CEN_0223-00.pdf
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Ex Safety Instruction (XA)
XA Memosens CLS15E, CLS16E, CLS21E, CLS82E
Digital conductivity sensors with Memosens technology
INMETRO Ex ia IIC T3/T4/T6 GaEN 04/11/2024Language:
English
Version:
04/11/2024
File size:
502.8 KB
File name:
XA02078CEN_0224-00.pdf
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Ex Safety Instruction (XA)
XA Memosens CLS15E, CLS16E, CLS21E, CLS82E
EAC Ex 0Ex ia IIC T3/T4/T6 Ga X
Safety instructions for electrical apparatus in explosion-hazardous areasEN 03/02/2026Language:
English
Version:
03/02/2026
File size:
486 KB
File name:
XA02081CEN_0226-00.pdf
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Ex Safety Instruction (XA)
XA Memosens CLS15E, CLS16E, CLS21E, CLS82E
Digitala konduktivitetssensorer med Memosens-teknik
ATEX: II 1 G Ex ia IIC T3/T4/T6 Ga
IECEx: Ex ia IIC T3/T4/T6 GaEN 13/03/2024Language:
Swedish
Version:
13/03/2024
File size:
498.2 KB
File name:
XA02080CSV_0224-00.pdf
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Fields of Activities (FA)
水質分析の専門知識
センサからすべてを備えた
ターンキーソリューションまでLanguage:
Japanese
Version:
30/06/2025
File size:
4.6 MB
File name:
FA01018CJA_0422_Analysis_Portfolio_lowres.pdf
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Fields of Activities (FA)
Sensoren, Messumformer, Kompaktgeräte and Armaturen
Kompetenz in der Flüssigkeitsanalyse
Language:
German
Version:
02/02/2026
File size:
4.3 MB
File name:
FA00007C_DE_Analyse_22-26_LowRes.pdf
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Fields of Activities (FA)
Sensors, transmitters, compact devices and assemblies
Experts in Liquid Analysis
Language:
English
Version:
02/02/2026
File size:
4.2 MB
File name:
FA00007C_EN_Analyse_22-26_LowRes.pdf
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Fields of Activities (FA)
Endress+Hauser 水質分析計ファミリ
ラインナップと事例
Language:
Japanese
Version:
23/03/2017
File size:
34.8 MB
File name:
FA00007CJA_2022_Endress Hauser liquid analysis family.pdf
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Manufacturer Declaration
Product family: ConduMax W, Memosens
Product root: CLS21-, CLS21E-
Declaration number: HE_02148_01.25
Manufacturer specification: Food hygiene
Additional information: Japan Food contact materialLanguage:
English
Version:
03/07/2025
File size:
311.2 KB
File name:
HE_02148_01.25_CLS21.pdf
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Miscellaneous
Product family: ConduMax H, ConduMax W, InduMax H, InduMax P, Memosens
Product root: CLS12-, CLS13-, CLS15-, CLS15E-, CLS16-, CLS16E-, CLS21-, CLS21E-, CLS50-, CLS50D-, CLS54-, CLS54D-, CLS82E-
Region: Eurasian Economic Union
Approval agency: T-Standard
Approval number: ЕАЭС KZ 7500525.13.12.00631Language:
Russian
Version:
10/02/2025
File size:
1.2 MB
File name:
EAC EMC KZ LF sensors.pdf
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