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3.2.4 Installation of transmitters with separators (FKB, FKD, FKM)
(1) Differential pressure transmitters with separators (FKD)
Locate the “high” and “low” pressure sides
The high (H) and low (L) pressure symbols are indicated on the measuring cell. The high pressure
side is always equipped with a specific flange connection, welded to a capillary or a rigid sleeve
that allows a separator to be connected.
In general, the low pressure side (L) also has this.
Flange seal mechanism.
A flat seal must be installed between the flange of the separator and the flange of the tank to be
fitted. The seal must be selected based on the type of flange fitted to the separator. Its internal
diameter must be greater than or equal to that of the measurement membrane, so that it does
not press on the latter, which would give a false measurement.
The standard dimensions of the membranes are as follows:
DN of the flange
Diameter of membrane (mm)
DN80 / 3”
stainless steel: 73
Quality materials: 89
DN100 / 3”
stainless steel: 96
Quality materials: 89
For other types of flanges, consult Fuji Electric.
Screw tightening method of the mounting flange.
Tighten the screws diagonally and in three passes using the proper tightening torque for these
screws, according to the standard of the flange used.
Seal
H
L
