Fujimoto Fuji Differential Pressure Transmitter FKK 4 User Manual
Page 44
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In case of differential transmitter (code symbol : FKK/FDK) :
Bolt
Measurement
chamber
detecting cover
O-ring
Nut
Seal diaphragm
Seal tape
Seal tape
(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 for 15 minutes, and make sure there is no leakage.
Replacing procedure
(1) Remove four hexagon socket head bolts with a torque wrench, etc..
(2) Disassembly gives access to the casing covers, O-rings, hexagon socket head bolts and nuts.
(3) After disassembly, replace the faulty part with a new one.
(4) Before reassembly, clean the O-ring face of casing cover with the soft cloth immersed in
water, alcohol, or similar detergent.
(5) Reassemble the detecting unit by reversing the disassembling procedure. The casing covers
should be assembled so as to be symmetrical with each other in the left-right direction and
carefully so as not to damage the seal diaphragm. Tightening torque should follow the table
below.
Replacement of the internal parts of detecting unit
Tightening Maximum working
torque
pressure
Bolt size Bolt material
[N•m]
[MPa]
Application
(kgf•m)
{bar}
<ft-lb>
<psi>
50
42
M10
Cr-Mo steel
(5)
{420}
Working pressure 42 MPa {420 bar} <6000 psi> or less
<36>
<6000>
SUS304
30
10
M10
ASTMB7M
(3)
{100}
Working pressure 10MPa {100 bar} <1400 psi> or less
ASTML7M
<22>
<1400>
50
42
M10
SUS630
(5)
{420}
Working pressure 42 MPa {420 bar} <6000 psi> or less
<36>
<6000>