Liquisys M CLM223/253 Electrical connection
Endress+Hauser 21
Panel-mounted instrument measuring cable connection
To connect a conductivity sensor, connect the measuring cable in accordance with the
terminal assignment to the terminals on the rear of the device (see connection sticker).
Example of connecting a conductivity sensor
4.1.4 Alarm contact
a0008919
Fig. 13: Connection of conductive sensors
a0008918
Fig. 14: Connection of inductive sensors
a0006415
Fig. 15: Recommended fail-safe switching for the alarm contact
A Normal operating status B Alarm condition
Normal operating status:
Device in operation and no error message
present (alarm LED off)
• Relay energized
• Contact 42/43 closed
Alarm condition
Error message present (alarm LED red) or
device defective or voltage-free (alarm LED off)
• Relay de-energized
• Contact 41/42 closed
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