
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
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The conductivity of a liquid can be measured using the conductive or toroidal measuring principles. This video shows what it is about and how these measuring principles work.
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Memosens converts the measured value to a digital signal and transfers it to the transmitter without a contacting connection. This video shows how Memosens optimizes process control and maintenance.
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
|
Simplicity
|
Lean selection Handle your core processes easily |
Technical excellence
|
Simplicity
|
Extended selection Optimize your processes with innovative technologies |
Technical excellence
|
Simplicity
|
Xpert selection Master your most challenging applications |
Technical excellence
|
Simplicity
Variable |
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Measuring principle
Conductive
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Application
Water, waste water, process, media separation, industrial water
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Characteristic
2-electrode system for application in the middle application range
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Measurement range
k=1: 10 µS/cm to 20 mS/cm
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Measuring principle
Conductive conductivity cell with graphite electrodes for applications in the middle range
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Design
2-electrode system with parallel arranged electrodes
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Material
Sensor shaft: PES
Electrodes: graphite -
Dimension
Diameter: 24 mm (0.94 inch)
Length: 61 mm (2.40 inch) -
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) -
Temperature sensor
NTC 30K
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Ex certification
ATEX, NEPSI, EAC
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Connection
Process connection: DN25, DN40, G1, NPT 1"
Cable: Memosens connector CYK10 -
Ingres protection
IP68 (connector)
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