
8.3.2 Disassembly of CPM 253
• Open and remove the connection
compartment cover (Pos. 420).
• Pull out the mains terminal (Pos. 470) to
make the device voltage-free.
• Open the display cover (Pos. 410) and
loosen the ribbon cable (Pos. 310 / 320) on
the side of the electronics box (Pos. 330).
• Dismantling the controller (Pos. 40):
Loosen screw (Pos. 450b) in the display lid.
• Removal of electronics box (Pos. 330):
Loosen screws (Pos. 450a) in the bottom of
the housing 2 revolutions, then slide entire
box backward and remove towards the top.
Make absolutely sure that the module locks
do not open!
Bend the module latches outward and
remove the module(s).
• Dismantling the docking module (Pos. 340):
Loosen screws (Pos. 450c) in the bottom of
the housing and remove entire module
towards the top.
• 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.
8.3.3 Assembly of CPM 253
• Insert the module(s) in the electronics box
guide rails carefully and latch into the
lateral lugs in the box.
• Incorrect assembly is not possible!
Modules incorrectly inserted into the
electronics box can not be put into
operation because the ribbon cables can
not be plugged in if this is the case.
• Make sure that the cover gaskets are intact
since they are required to guarantee
protection class IP 65.
Diagnosis and corrective maintenance Liquisys M CPM 223 / 253
72 Endress+Hauser
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