Endress+Hauser CPS11D-7BA21 | Memosens pH Electrode, 0–14 pH, Pg 13.5, Gel

Endress+Hauser CPS11D-7BA21 | Memosens pH Electrode, 0–14 pH, Pg 13.5, Gel

Endress+Hauser CPS11D-7BA21 digital pH sensor with Memosens 2.0. 0–14 pH range, gel reference, PTFE diaphragm, Pg 13.5 process connection, IP68, for water & wastewater.

Product Overview

The Endress+Hauser CPS11D-7BA21​ is a digital pH glass electrode​ from the Memosens CPS11D series​ — the industry-standard sensor for continuous pH measurement in water, wastewater, and utility applications. It features Memosens 2.0 digital technology​ for contactless signal transmission and lab calibration. Designed for general-purpose use, it has a gel-filled sealed reference system, PTFE ring diaphragm, and a Pg 13.5 (∅ 27 mm) threaded process connection. The sensor is suitable for measuring pH in the 0–14 range​ with integrated NTC 30kΩ temperature sensor.

Technical Specifications (Measurement & Electrical)

Technical Specifications (Mechanical & Process)

Key Features

• Memosens 2.0 Digital:​ Inductive coupling eliminates moisture issues at the connector, stores calibration data/sensor ID in the sensor head — enables lab pre-calibration and plug-and-play replacement.

• Sealed Gel Reference:​ Maintenance-free gel system with double-chamber KNO₃ bridge​ and PTFE ring diaphragm​ for resistance to sulfide (S²⁻), cyanide (CN⁻), and heavy metal ion poisoning.

• Robust for Process Water:​ PPS housing​ and chemical-resistant materials ensure long-term stability in water & wastewater media.

• System Compatibility:​ Connects directly to Liquiline CM442 / CM42 / CM82 transmitters​ or any Memosens-compatible system.

Applications

• Wastewater Treatment:​ pH monitoring in inlet, neutralization basins, and effluent discharge.

• Drinking Water:​ Post-chlorination pH verification and raw water monitoring.

• Industrial Water:​ Cooling water, boiler feedwater, and chemical dosing control loops.

• Chemical Process (Mild):​ Acid/alkali concentration monitoring in non-aggressive process streams.

Note: The CPS11D-7BA21 is essentially the same sensor as CPS11D-7BA2G with a different regional/item variant code. Both are sealed gel, PTFE diaphragm, Pg 13.5, Memosens 2.0 pH electrodes for general water & wastewater duty.