Fujimoto Fuji Differential Pressure Transmitter FKK 4 - Manual (Page 51)

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Hold the hexagonal area of the vent/drain plug
with a wrench and remove it by turning slowly.
Peel the existing seal tape and wind a new seal
type. Then, screw the vent/drain plug into the
process connection for changing.
Tightening torque: 25N•m (2.5kgf•m) <18ft-lb>
Ensure a space of about 500mm against the cover in order to facilitate check, adjustment, etc.
500
500 500
Process connection
Change of vent/drain plug position
Check space