
Specs at a glance
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Measurement range
pH 1 to 12
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Process temperature
0 to 80 °C
(32 to 176 °F) -
Process pressure
1 to 4 bar
(15 to 60 psi)
Field of application
Memosens CPS31D is the digital expert for pH compensation in disinfection processes. Its three diaphragms make it suitable for minimum conductivity while its low drift guarantees stable measurement. The sensor makes sure that swimming pool water is agreeable and drinking water tasteful. Memosens CPS31D is not the latest Memosens generation. To get information on the new Memosens CPS31E sensor with extended functionality, click here.
Drinking water
Swimming pool water
pH compensation for free chlorine measurement
Benefits
Reliable measurement at minimum conductivity thanks to three diaphragms
Low drift by very low level of ion depletion in electrolyte
Optional salt ring for extended operating time
Maximum process safety through non-contact inductive signal transmission
Enables predictive maintenance due to storage of sensor and process-specific data
Reduced operating costs due to minimized process downtime and extended sensor lifetime
Videos
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The pH-value of a liquid can be calculated using the potentiometric measurement principle. This video shows what it is about and how this measuring principle works.
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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
Potentiometric
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Application
Drinking water and swimming pool water,
pH compensation for measuring free chlorine -
Characteristic
Standard applications in water, long lifetime
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Measurement range
pH 1 to 12
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Measuring principle
Gel filled reference with one or three diaphragms, optional saltring
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Design
Shaft with temperature sensor
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Material
Glass and Ceramic
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Dimension
Diameter: 12 mm (0.47 inch)
Shaft length: 120 mm (4.70 inch) -
Process temperature
0 to 80 °C
(32 to 176 °F) -
Process pressure
1 to 4 bar
(15 to 60 psi) -
Temperature sensor
NTC 30k
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Ex certification
None
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Connection
Memosens plug-in head for digital, non-contact data transmission
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Ingres protection
IP68
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