8.5.2
Dismantling of CPM 253
• Open and remove the connection
compartment cover (item 420).
• Pull off the power connection terminal strip
(item 470) to de-energize the instrument.
• Open the display lid (item 410) and
remove the ribbon cables (item 310 / 320)
on the side of the electronics box (item
330).
• Removal of central module (item 40):
Loosen the screw (item 450b) in the
display lid.
• Removal of electronics box (item 330):
Unscrew the screws (item 450a) in the
bottom of the housing 2 revolutions, then
slide entire box backward and remove
towards the top.
Make sure that the module catches do not
come unlatched!
Bend the module latches outward and
remove the module(s).
• Removal of docking assembly (item 340):
Remove the screws (item 450c) in the
bottom of the housing and remove the
entire assembly towards the top.
• Removal of pH/mV transmitter (item 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.
8.5.3
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 inserted in the electronics box
incorrectly are not operable since the
ribbon cables cannot be inserted.
• Make sure that the cover gaskets are intact
since they are required to guarantee
protection class IP 65.
8.5.4
Spare parts for CPM 253
Item
Designation
Name
Function
Order number
10
Power supply unit
LSGA
100/115/230 V AC
51500317
20
Power supply unit
LSGD
24 V AC + DC
51500318
290
Relay module
LSR1-2
2 relays
51500320
300
Relay module
LSR1-4
4 relays
51500321
40
Central module
LSCH-S1
1 current output
51501081
40
Central module
LSCH-S2
2 current outputs
51501082
40
Central module
LSCH-H1
1 current HART
51501083
40
Central module
LSCH-H2
2 current HART
51501084
40
Central module
LSCP
Profibus PA/no current output!
51501085
230
pH/mV transmitter
MKP1
pH/mV + temperature input
51501080
999
pH/mV terminal assembly
pH/mV tscreen plate
51501071
370, 410,
420, 430,
460
Housing cover
Display lid, connection
compartment cover, front
membrane, hinges, cover
screws, small parts
51501068
400, 480
Bottom of housing
Bottom, cable glands
51501072
330, 340,
450
Internal housing parts
Docking assembly, empty
electronics box, small parts
51501073
310, 320
Ribbon cables
2 ribbon cables
51501074
430
Hinges
2 pairs of hinges
51501069
PM253E08.CHP
Liquisys M CPM 223 / 253
Diagnosis and corrective maintenance
Hauser
63