ENDRESS+HAUSER  CPS31D-7AC21

• Drinking water
• Swimming pool water
• pH compensation for measuring free chlorine

• One or three ceramic diaphragms
• Optional salt ring for extended operating life
• Very low level of ion depletion in electrolyte
• Gel filling, no electrolyte refill required
• Can be used up to 4 bar (60 psi) absolute pressure
• Can be used up to 80 ̊C (176 °F)
• Shaft length 120 mm
• Memosens plug-in head
• ESA or GSA plug-in head

• Maximum process safety thanks to non-contact, inductive signal transmission
• Digital data transmission ensures data security
• Very easy to use as sensor-specific data are stored in the sensor
• Recording of sensor load data in the sensor enables predictive maintenance

The pH value is a measure of the acid or base character of a medium. Depending on the pH value of the medium, the electrode's membrane glass provides an electrochemical potential. This is the result of H + ions selectively penetrating the outer layer of the membrane. As a result, an electrochemical boundary layer forms here with an electric potential. An integrated Ag/AgCl reference system forms the required reference electrode.

The transmitter converts the measured voltage into the corresponding pH value according to the Nernst equation.