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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 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.

Part# with Options:        CLS15D-A1A1
Price with Options:        Please Email us your request for quote   


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

  Availability 4 Days  ]


Measurement in pure and ultrapure water range:

  • Monitoring of ion exchangers
  • Reverse osmosis
  • Distillation
  • Chip cleaning

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

  • Liquiline CM442/CM444/CM448 (only CLS15D)
  • Liquiline CM42
  • Liquiline CM14 (only CLS15D)
  • Liquisys CLM223/253 (only CLS15)
  • Mycom CLM153 (only CLS15)

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

Your benefits
  • High measuring accuracy as cell constant is individually measured
  • Installation in pipe or flow assembly
  • Compact design
  • With plug-in head (IP68 (CLS15D), IP67 (CLS21)) or fixed cable (IP67)
  • Easy to clean thanks to electropolished surfaces
  • Sterilizable up to 140 C (284 F)
  • Stainless steel 1.4435 (AISI 316L)
  • Quality certificate stating the individual cell constant
  • Inspection certificate EN 10204 3.1 (optional)
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
  • Predictive maintenance possible as sensor load data logged in the sensor
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 CLS15D or CLS15
  • 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, power plant, pharmaceuticals, process
Characteristic 2-electrode conductivity cell for pure and ultrapure water
Measurement range k=0,01: 0-20 S/cm
k=0,1: 0-200 S/cm
Measuring principle Conductive conductivity cell with polished stainless steel electrodes
Design 2-electrode conductivity cell with coaxially arranged electrodes, electropolished
Material Electrode: 1.4435
Electrode shaft: PES
Dimension Electrode diameter: 16 mm
(0.62 inch)
Electrode length: appr. 55 mm
(2.14 inch)
Process temperature max. 100C (140C / 30 min.)
(max. 212F (302F/30 min.)
Process pressure max. 12 bar at 20C
(174 psi at 68F)
temperature sensor NTC
Connection process: 1/2"NPT, 3/4" NPT, clamp 11/2"
Cable: Memosens connector
Ingres protection IP68
Additional Certifications Calibration certification of the cell constante, material certification 3.1

    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...

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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 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 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.




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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