Azbil KFDB, User Manual

Page: 26 / 48

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4-5-3. Calibration procedure for Specific-gravity Transmission
(1) This procedure is identical with that for liquid level transmission, except that the
following formulas should be used.
(a) Total weight W including the two weights, pan and others:
W = (Weight of float) −
π
·D
2
·L· ρ
L 4
where,
ρ
L
: Low limit of specific-gravity range
(b) Calibration weight (F) corresponding to buoyancy:
F =
π
·D
2
·H( ρ
H
− ρ
L
)
4
1+ α · π ·D
2
·H( ρ
H
− ρ
L
)
where, ρ
H
: High limit of specific-gravity range
4-5-4. Adjustment of Stopper
(1) When the instrument is shipped from the factory, the torque tube is installed in the
correct angle. When the torque tube housing, bonnet and side flange are detached in the
field and assembling them, pay attention to the following:
Adjust the gap at 2.5 mm from the low limit stopper by means of plays of the bolt holes
when the float is hung as shown in Fig. 4-3.
Fig. 4-3.