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PRODUCTS & SERVICES is a provider of process control instruments and field devices for Oil & Gas, Industrial Machinery, Pipelines, Custody Transfer, Tank Gauging, Waste Processing, Water Treatment Plants, Burner Management Systems and Incinerators, Conveyor Control, Food & Beverage, Motor, Pump & Compressor Control, Wireless Telemetry, Data Logging, Real-Time Process Data to Web.

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EH Condumax CLS21D 2-electrode Digital conductive conductivity sensor for medium and high measuring ranges. Memosens technology. NPT 1" or G1 Process Connection. IP68. ATEX, FM and CSA Approvals.

Part# with Options:        CLS21D-C1E1
Price with Options:        Please Email us your request for quote   


Measuring Range & Cell Constant
(1) Measuring Range & Cell Constant for EH CLS21D
Process Connection
(2) Process Connection for EH CLS21D
(3) Approval for EH CLS15D & CL21D

  Availability In Stock  ]


Measurement in media with average or high conductivity:

  • Separation of media with average conductivity (milk/water)
  • Separation of media with high conductivity (alkali/water)
  • Drinking water treatment
  • Wastewater treatment

Sensors with temperature probes are used in conjunction with conductivity measuring devices that support automatic temperature compensation:

  • Liquiline CM442/CM444/CM448 (only CLS21D)
  • Liquiline CM42
  • Liquiline CM14 (only CLS21D)
  • Liquisys CLM223/253 (only CLS21)

The resistivity in MΩ cm can also be measured using these transmitters.

Your benefits
  • Different designs for optimum adaptation to the process or mounting location
  • Installation in pipe or flow assembly
  • Compact design
  • With plug-in head (IP68 (CLS21D), IP65 (CLS21)) or fixed cable (IP67)
  • High chemical, thermal and mechanical resistance
  • Manufacturer inspection certificate stating the individual cell constant
Other advantages of Memosens technology
  • Maximum process safety owing to non-contact, inductive signal transmission
  • Data security thanks to digital data transmission
  • Very easy to use as sensor data saved in the sensor
  • Recording of sensor load data in the sensor enables predictive maintenance
Measuring principle

Conductivity of liquids is determined with a measuring arrangement where two electrodes are located in the medium. An alternating voltage that causes a current to flow through the medium is applied at these electrodes. The electrical resistance, or its reciprocal value - conductance G - is calculated based on Ohm's law. The specific conductance κ is determined from the conductance value using the cell constant k, which depends on the sensor geometry.

Measuring system

A complete measuring system comprises the following components at least:

  • The conductively measuring conductivity sensor CLS21D or CLS21
  • A transmitter, e.g. Liquiline M CM42
  • A measuring cable, e.g. Memosens data cable CYK10 or CYK71 for analog sensors

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 S/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 100C (212F)
max. 135C(max. 275F) 30 minutes
Process pressure max. 16 bar at 20С
(max. 232psi at 68F)
temperature sensor NTC
Connection Process connection: DN25, DN40, G1", Cable: Memosens connector CYK10
Ingres protection IP68 (connector)

    CM42-CAA000EAE00 EH Liquiline M CM42 Two-wire transmitter for Ex and non-Ex areas. One or two analog outputs. FOUNDATION Fieldbus, PROFIBUS PA and HART protocols. ATEX, FM, CSA, NEPSI and TIIS Approvals. ..

    CYK10-A031 EH CYK10 Memosens Measuring Cable for Digital Sensors. IP68. FM, ATEX and CSA Approvals for Ex...

    CLA111-00A EH Dipfit CLA111 immersion assembly for conductivity sensors in open and closed vessels. Includes DN100 flange connection and bayonet lock...

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EH Condumax CLS15 2-electrode Analog conductive conductivity sensor for applications in pure and ultrapure water. 1/2"NPT or 3/4" NPT Process Connection. IP67. ATEX Approval.




EH Condumax CLS16D 2-electrode Analog conductive conductivity sensor for hygienic applications. DN50 Process Connection. IP68. ATEX Approval.




EH Condumax CLS15D 2-electrode Digital conductive conductivity sensor for applications in pure and ultrapure water. Memosens technology. 1/2"NPT or 3/4" NPT Process Connection. IP68. ATEX, FM and CSA Approvals.




EH Condumax CLS21 2-electrode Analog conductive conductivity sensor for medium and high measuring ranges. NPT 1" or G1 Process Connection. IP65/67. ATEX Approval.




EH Condumax CLS16D 2-electrode Digital conductive conductivity sensor for hygienic applications. Memosens technology. DN50 Process Connection. IP68. ATEX, FM and CSA Approvals.




EH Condumax W CLS30 2-electrode conductivity sensor for waste water and concentrate applications. Pt100 temperature sensor. 0,1-200,0mS/cm measuring range. 10ft cable connection. PP/PTFE Material. DN25 Process connection. IP65. ATEX and qualitity certifications.



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