Transmitter for analog and digital glass and ISFET
sensors
Application
• Effluent treatment
• Neutralization
• Detoxication (electroplating)
• Water treatment
• Water monitoring
Your benefits
• Memosens technology
• Field or panel-mounted housing
• Universal application
• Simple handling
– Logically arranged menu structure
– Large two-line display
– Ultrasimple two-point calibration
• Safe operation
– Overvoltage (lightning) protection
– Manual contact control and user-defined alarm configuration
– Calibration plausibility check
The basic unit can be extended with:
• Additional 2 or 4 contacts for use as:
– Limit contacts (also for temperature)
– P(ID) controller
– Timer for simple rinse processes
– Complete cleaning with Chemoclean
– Current input
• Plus package:
– User defined current output characteristics
– Automatic cleaning trigger on alarm or limit violation
– Sensor Check System for pH glass and reference
– Live check of sensor
– Special neutralization controller
• HART or PROFIBUS-PA/-DP

• 2nd current output for temperature, pH/ORP or continuous controller

Features of the basic version pH and ORP value measurement
This is selected via the menu. During measurement, the value measured can be displayed in the other
measuring mode (e.g. pH - mV or ORP % - ORP mV). The temperature is displayed at the same time or,
if desired, not shown at all.
Calibration
pH electrodes are normally calibrated with the same pH values. Therefore the transmitter presents the
settings from the previous calibration as defaults for the next calibration. If the buffer solutions are
interchanged by accident (e.g. pH 4 buffer first, then pH 7 buffer instead of pH 7 first and then pH 4)
the plausibility check ensures that the calibration is accepted anyway.
Configuration
Different alarms are required depending on application and operator. Therefore the transmitter
permits independent configuration of the alarm contact and error current for each individual error.
Unnecessary or undesirable alarms can be suppressed in this manner. Up to four contacts Up to two
contacts can be used as limit contacts (also for temperature) to implement a P(ID) controller or for
cleaning functions.
Direct manual operation of the contacts (bypassing the menu) provides quick access to limit, control
or cleaning contacts, permitting speedy correction of deviations.

A complete measuring systems comprises:
• The transmitter Liquisys M CPM223 or CPM253
• A pH/ORP electrode with or without an integrated temperature sensor
• An immersible, flow or retractable assembly
• A measuring cable(e.g. CPK9)
Options: extension cable, junction box VBA or VBM