CPS31D

Summary

Product identification

• Product Names: Memosens CPS31D, Ceratex CPS31
• Type: pH sensors for drinking water and swimming pool water.
• Technology: Digital with Memosens technology or analog.

Application

• Drinking water
• Swimming pool water
• pH compensation during the measurement of free chlorine.

Features and Benefits

• Gel-filled reference system with ceramic junction.
• One or three ceramic junctions.
• Optional salt storage for extended operating life.
• Very low ion depletion of electrolyte.
• Gel filling, no electrolyte refill required.
• Memosens plug-in head or ESA or GSA plug-in head.

Memosens Technology Advantages

• Maximum process safety with non-contact, inductive signal transmission.
• Data security thanks to digital data transmission.
• Easy to use: sensor data saved in the sensor.
• Predictive maintenance enabled by recording sensor load data.

Input

Measured variables

• pH value
• Temperature

Measuring range

• pH: 1 to 12
• Temperature: 0 to 80 °C (32 to 176 °F)

Conductivity

• Min. 100 µS/cm
• Min. 50 µS/cm for "AC" version (three junctions)

Operating limits

Process temperature range

• 0 to 80 °C (32 to 176 °F)

Process pressure range

• 1 to 4 bar (14.5 to 58 psi) (abs.)

Operating temperature range (environment)

• -15 °C to 50 °C (5 °F to 122 °F) (Note: Sensor must not be used below -15 °C (5 °F) due to risk of frost damage.)

Storage temperature

• 0 to 50 °C (32 to 122 °F)

Electrical

Electrical connection

• Memosens sensors use a Memosens plug-in head.
• Analog sensors can use ESA or GSA plug-in heads with measuring cables CPK9 or CPK1.

Mechanical construction

Design, dimensions

• Overall length: 120 mm (4.70 in)
• Shaft diameter: ø 12 mm (0.47 in)

Weight

• 0.1 kg (0.2 lb)

Materials

• Electrode shaft: Glass to suit process
• pH membrane glass: Type A
• Metal lead: Ag/AgCl
• Diaphragm: Ceramic
• Temperature sensor: NTC 30K (CPS31D), Pt 100 (CPS31)
• Plug-in head: Memosens (CPS31D), ESA, GSA (CPS31)

Process connections

• Pg 13.5

Reference system

• Ag/AgCl, gel, 3M KCl
• Optional: Salt ring, KCl saturated

Installation

• Do not install sensors upside-down.
• Angle of inclination from the horizontal must be at least 15°.
• Hand-tighten sensor with a torque of 3 Nm (2.21 lbf ft) when installing in Endress+Hauser assemblies.

Environment

Degree of protection

• GSA plug-in head: IP 67
• ESA plug-in head: IP 68 (1 m (3.3 ft) water column, 50 °C (120 °F), 168 h)
• Memosens plug-in head: IP 68 (10 m (33 ft) water column, 25 °C (77 °F), 45 days, 1 M KCl)

Electromagnetic compatibility (EMC)

• Interference emission and interference immunity as per EN 61326:2012

Disclaimer This extracted information may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror