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Bolt size
Bolt material
Tightening torque
Maximum working pressure
M10
Cr-Mo steel
50 N.m
420 bar
M10
SUS 316
30 N.m
100 bar
M10
SUS 630
50 N.m
420 bar
M12
Cr-Mo steel
60 N.m
420 bar
M12
SUS 660
60 N.m
420 bar
M16
SUS 660
110 N.m
500 bar
M20
SUS 660
260 N.m
1035 bar
(6) After assembly, carry out a pressure test. Apply a pressure equal to 150% of the maximum
working pressure to both high pressure (H) and low pressure (L) measurement chambers of
the transmitter simultaneously during 15 minutes, and make sure that there is no leakage.
(1) Remove the 4 hexagon socket head bolts.
(2) The process covers, the O ring and the bolts and nuts can now be removed.
(3) After disassembly, replace the faulty part with a new ones.
(4) Before reassembling, clean carefully the O ring groove of the process cover with a soft
cloth immersed with water, alcohol, Freon TF or similar.
(5) Reassemble the detecting unit by reversing the disassembling procedure.
Please check the correct position of the process covers to avoid that the diaphragms of the
measuring cell are damaged. The torque for the bolts of the process covers are indicated
in the following table.
Replacement of the internal parts of detecting unit
In case of differential and flow transmitter (code symbol: FKC/FKD)
Nut
Seal diaphragm
Measurement
chamber cover
Bolt
O-ring (or gasket)
Seal tape
ATTENTION
To avoid any damage of the measuring cell, do not exceed the test pres-
sure of the different cells (please refer to the technical datasheets of the
concerned transmitter)