ENDRESS+HAUSER  CLS21D-C1E1

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.

• 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

• 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

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.

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