E+H Liquisys CPM253 Industrial pH/ORP Transmitter & Controller

The CPM253 Liquid Analysis pH/ORP Transmitter stands as an industry-leading standard for continuous, highly accurate water quality monitoring and process control across industrial facilities. Built as a rugged 4-wire field housing unit, this transmitter is engineered to withstand challenging outdoor and harsh process environments ranging from municipal wastewater treatment plants to demanding chemical manufacturing loops. It offers dual-measuring functionality, enabling operators to seamlessly switch between pH measurement and Redox potential monitoring according to specific operational needs.

Designed to maximize sensor longevity and measurement integrity, the CPM253 supports both traditional analog glass or ISFET electrodes and next-generation digital Memosens technology. By utilizing contactless inductive signal transmission, digital Memosens sensors completely eliminate interference caused by moisture, corrosion, and cable distance. Furthermore, operators can perform sensor calibration in a controlled laboratory environment and hot-swap sensors directly in the field, which significantly minimizes plant downtime and simplifies routine maintenance schedules.

Operational safety and system automation are at the core of the CPM253 design. The integrated continuous Sensor Check System constantly evaluates glass impedance and reference electrode health, instantly triggering alarms in the event of glass breakage, electrode fouling, or signal loss to prevent costly batch errors. To maintain peak sensor performance in dirty or sticky media, the unit controls an automated Chemoclean cleaning cycle that rinses sensor heads on a scheduled or alarm-triggered basis. Complete with flexible output options including galvanically isolated 0/4-20mA signals, built-in PID control loops for direct pump and valve actuation, and digital fieldbus communication such as HART and PROFIBUS, the CPM253 delivers an all-in-one analytical solution for complex process automation.

FAQ
Q1: Can the CPM253 handle both pH and ORP measurements simultaneously?

A: The CPM253 can be configured for either pH or ORP (Redox) measurement via the intuitive display menu. While in operation, the transmitter can simultaneously display temperature and convert/show corresponding mV or % values.

Q2: What is the benefit of Memosens sensor compatibility on the CPM253?

A: Memosens technology digitizes the signal directly inside the sensor head, eliminating signal interference caused by humidity or long cable runs (up to 100 meters). It also enables laboratory pre-calibration and true plug-and-play field installation.

Q3: Does this transmitter support automatic pump/dosing control?

A: Yes. When equipped with the optional extension package, the CPM253 offers built-in PID controller capabilities (pulse length or pulse frequency) to drive metering pumps and control valves directly for precise pH neutralization.

Q4: How does the Sensor Check System (SCS) improve maintenance efficiency?

A: SCS continuously tests the glass and reference electrodes for cracks, coating, or blockage. If an anomaly is detected, the unit alerts the operator immediately, preventing erroneous dosing and unnecessary downtime.

Technical Specifications

Reviewed product specifications

Measurement Principle	Glass electrode
Applications	Water, wastewater, process
Features	Four-wire transmitter
Design	pH/ORP field-mounted PC/ABS housing
Material	PC/ABS housing
Dimensions	247x170x115mm (9.63x6.63x4.48inch)
Temperature sensor	Display and current output
Explosion-proof certification	No
Protection class	No
Input	Single-channel transmitter
Output	0/4...20 mA, HART, Profibus
Other certifications	CSA general certification

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