Endress+Hauser Ceratex CPS31 is an analog pH sensor specifically designed for drinking water, swimming pool water and pH compensation in free chlorine measurement. Its three-diaphragm reference system is designed for reliable measurement in media with minimum conductivity, while the low level of ion depletion helps reduce measurement drift.
Key Features
• Analog potentiometric pH measurement
• Measuring range: pH 1 to 12
• Designed for minimum-conductivity water
• Three-diaphragm reference system
• Gel-filled reference system
• Low drift due to very low ion depletion
• Optional salt ring for extended operating time
• Glass / ceramic construction
• Shaft length: 120 mm
• Optional Pt100 temperature sensor
• GSA or TOP68 connection
• IP68 ingress protection
• Process temperature: 0 to 80 °C
• Process pressure: 1 to 4 bar abs
Suitable Applications
• Drinking water treatment
• Swimming pool water monitoring
• pH measurement in low-conductivity water
• pH compensation for free chlorine measurement
• Water disinfection processes
• Standard water analysis applications requiring long sensor lifetime
Selection Notes
CPS31 is best selected when the application involves low-conductivity water, particularly drinking water, swimming pool water or disinfection processes. Its three-diaphragm design is specifically intended to maintain reliable measurement under minimum conductivity conditions.
When replacing an existing CPS31, check the complete sensor configuration, including the connection type, temperature sensor option and reference system configuration. The standard sensor has a 120 mm shaft and is available with GSA or TOP68 connection and with or without a Pt100 temperature sensor.
For applications outside the specified pH 1–12, 0–80 °C and 1–4 bar abs ranges, another Endress+Hauser pH sensor may be more appropriate depending on the process conditions.
FAQ
What does the Endress+Hauser CPS31 measure?
CPS31 is an analog pH sensor for measuring the pH value of liquid media.
What is the measuring range of CPS31?
The official measuring range is pH 1 to 12.
What applications is CPS31 designed for?
It is designed for drinking water, swimming pool water and pH compensation for free chlorine measurement.
Can CPS31 be used in low-conductivity water?
Yes. The three-diaphragm reference system is specifically designed to provide reliable measurement under minimum-conductivity conditions.
What is the maximum process temperature of CPS31?
The specified process temperature range is 0 to 80 °C.
What is the process pressure range?
The official specification is 1 to 4 bar absolute.
Does CPS31 have a temperature sensor?
CPS31 can be supplied with or without an integrated Pt100 temperature sensor.
What connections are available for CPS31?
The official product information lists GSA and TOP68 connections.
