Liquisys M CPM223/253 Electrical connection
Endress+Hauser 21
Field instrument measuring cable connection
Proceed as follows to connect a pH-electrode to the field instrument:
1. Open the housing cover to access the terminal block in the connection compartment.
2. Break the punching of a cable gland from the housing, mount a PG gland and guide the
cable through this Pg gland.
3. Connect the cable in accordance with the terminal assignment .
4. Tighten the Pg gland.
Moisture could cause incorrect measurement
‣ Protect the connectors, cable ends and terminals against moisture.
Panel-mounted instrument measuring cable connection
To connect a pH electrode to the panel-mounted instrument, connect the cable in accordance
with the terminal assignment to the terminals on the rear of the device.
If you are using glass electrodes with the panel-mounted instrument, you have to terminate
the measuring cable with a BNC connector. A solder-free BNC connector is supplied with the
device.
Proceed as follows:
1. Cut off end sleeves 2 and 3 of the coaxial
cable ( å 13).
C07-CPM223xx-04-06-00-xx-013.eps
Fig. 13: Cable CPK1: device connection
1Coaxial cable
2 Inner screen BK (ref.)
3 Inner coax (pH / mV)
4Strand BN (PM)
2. Push the cable gland 5 and the washer 6
onto the coaxial cable.
3. Remove the insulation (13 mm(0.51"))
and screw the clamping ring 7 onto the
insulation.
Parts 5 to 7 are supplied with the BNC
connector for cable diameters 3.2 mm
(0.13") and 5 mm (0.20").
4. Fold the braided screen 8 of the screen
over the clamping ring and cut off the
excess material.
5. There is a semi-conductor layer 14
(conductive foil) between the inner
insulation and the braided screen 8. Strip
this semi-conductor layer to the braided
screen.
C07-CPM223xx-04-06-00-en-014.eps
Fig. 14: Terminating the pH connecting cable for mounting
the BNC elbow plug
6. Remove the inner insulation (4 mm
(0.16")).
7. Position end sleeve 13 onto the stripped
inner conductor and secure the end sleeve
with a crimping pliers.
C07-CPM223xx-04-06-00-en-015.eps
Fig. 15: Terminating the pH connecting cable for mounting
the BNC elbow plug
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