
8.2.2 Disassembly of CPM 223
• Consider potential effects on process
when removing the instrument from service!
• First pull off the terminal block
(Pos. 422 b) on the rear side of the device,
to make the device voltage-free.
• First pull off the terminal blocks
(Pos. 422 a and if necessary 430) on the
rear side of the device, to make the device
voltage-free.
• Press the latches of the end frame (Pos.
340) inwards and pull off the frame towards
the rear.
• Loosen the special screw (Pos. 400) by
turning it counterclockwise.
• Remove the complete electronics block
from the housing. The modules are
plugged together mechanically and can be
easily separated:
- Simply pull processor/display module
forwards
- Pull flaps on the back panel gently
outwards, the lateral modules can then
be removed.
• Dismantling the pH/mV Transmitter
(Pos. 230):
– Bend the screen plate upward
– Pull off the stranded wire (plug-in
connection; pH input from BNC socket),
then pull off the module towards the top.
8.2.3 Assembly of CPM 223
• Reverse the dismantling sequence for
assembly.
• Hand-tighten the special screw without
using a tool.
• Incorrect assembly is not possible!
A module block which has been plugged
together incorrectly cannot be inserted into
the housing.
PM253E08.CHP
Liquisys M CPM 223 / 253 Diagnosis and corrective maintenance
Endress+Hauser 69
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