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Analog pH sensor
Ceratex CPS31

Analog pH sensor
Ceratex CPS31 ©Endress+Hauser
Analog pH sensor
Ceratex CPS31 ©Endress+Hauser

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.

Glass electrode for application in drinking water and swimming pools

Ceratex CPS31 is the analog 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.

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  • 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

  • Field of application

    • Drinking water

    • Swimming pool water

    • pH compensation for free chlorine measurement

Features and specifications



  • Measuring principle

    Glass electrode

  • Application

    Drinking water and swimming pool water, pH compensation to measure free chlorine

  • Characteristic

    Standard applications in water, long lifetime

  • Measurement range

    pH 1 - 12

  • Measuring principle

    Gel filled reference with one or three diaphragms, option saltring

  • Design

    Shaft length 120 mm, with or w/o temperature sensor

  • Material

    Glass / Ceramics

  • Dimension

    Shaft length 120 mm

  • Process temperature

    0 - 80 C (32 - 176 F)

  • Process pressure

    1 - 4 bar abs (15 - 60 psi)

  • Temperature sensor

    None or Pt 100

  • Ex certification


  • Connection

    GSA or Top 68

  • Ingres protection


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