Electrical connection Liquisys M CPM223/253
18 Endress+Hauser
Pay attention to the following:
• The device is approved for protection class II and is generally operated without a protective
earth connection.
• To guarantee measuring stability and functional safety, you have to ground the outer
screen of the sensor cable:
– Glass electrodes (PR/PS device version): terminal "S"
– ISFET sensors (IS device version): PE distributor rail
This is on the cover frame for panel-mounted instruments and in the connection
compartment for field devices.
• Ground the PE distributor rail or the ground terminal.
Field instrument connection
Guide the measuring cables through the PG glands into the housing. Connect the measuring
cables in accordance with the terminal assignment ( å 10).
Nonobservance could cause incorrect measurement
‣ Make sure to protect the connectors, cable ends and terminals against moisture.
‣ Terminals marked NC may not be wired.
‣ Unmarked terminals may not be wired.
C07-CPM253xx-04-06-00-xx-002.eps
Fig. 10: Field instrument connection compartment sticker
1 PE distributor rail for IS device version
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