Liquisys M CPM223/253 Repair
Endress+Hauser 95
9.3 Dismantling the field instrument
Please note the effects on the process if the device is taken out of service!
Please refer to the diagram for the item numbers.
1. Open and remove the cover of the connection compartment (item 420).
2. Disconnect the mains terminal (item 470) to de-energise the device.
3. Open the display cover (item 410) and loosen the ribbon cables (item 310 / 320) on the
side of the electronics box (item 330).
4. To remove the central module (item 40), loosen the screw in the display cover (item
450 b).
5. Proceed as follows to remove the electronics box (item 330):
– Release the screws in the housing base (item 450 a) in two revolutions.
– Then push the entire box backwards and remove it from above.
– Make sure that module locks do not open!
– Bend the module locks out and remove the modules.
6. To remove the docking module (item 340), remove the screws in the housing base (item
450 c) and remove the entire module from above.
7. Proceed as follows to remove the pH/mV transmitter (item 230):
– Bend the screening plate up.
– Disconnect the connected strand (pH input, strand comes from the BNC connection
jack).
– Using a fine side-cutting pliers, nip off the heads of the synthetic distance sleeves.
– Then remove the module from above.
To assemble, carefully push the modules into the trolley tracks of the electronics box and let
them engage in the side box noses.
Incorrect mounting is not possible. Modules inserted in the electronics box incorrectly
are not operable since the ribbon cables cannot be connected.
Make sure the cover seals are intact to guarantee IP 65 ingress protection.
A Fuse Part of power unit, item 10
B Choice of line voltage Position of jumper item 30 on power
unit, item 10 depending on line
voltage
Item Kit description Name Function/contents Order number
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