Azbil KFDB, Руководство пользователя

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4-5. Calibration of Liquid Level Transmitter (KFLB _ _ -61/62)
(1) Fix the torque tube assembly together with the transmitter to a bench by using, for
example, a vice as shown in Fig. 4-2.
Note: Exercise care so that no unreasonably large torque is applied to the torque tube.
Fig. 4-2.
(2) Prepare a weighing pan as shown in Fig. 4-2 and hang it on the pin at the end of the
torque tube using a thread or fine wire looped into two circlets.
4-5-1. Calibration Formula and procedure for Liquid Level Transmission
(1) To calculate the weight (buoyancy) for calibration, use the following formula:
F =
π
·D
2
·H· ρ
4
1+ α · π ·D
2
· ρ
where, F : Calibration weight (grams) corresponding to buoyancy
D : Outer diameter (cm) of float
H : Measuring range (cm)
ρ : Density of the liquid
α : Parameter
2.05 × 10
-5
(External or internal chamber, top type; torque arm length
110 mm)
8.93 × 10
-5
(Internal chamber, side type; torque arm length 286 mm)
1.09 × 10
-4
(Internal chamber, side type; (JPI600, JIS63K); torque arm
length 350 mm)