<5. Maintenance>
5-1
IM 02C01B04-01EN
5. Maintenance
5.1 Calibration Notes
Calibration is required if the transmitter has been
taken apart for cleaning or for parts replacement,
if a change of range is desired, or if the amount of
zero elevation or zero suppression (if transmitter is
so equipped) is changed substantially.
If the capsule was removed or the flexure cap screw
loosened, before calibrating, make the flexure cap
screw adjustment.
The transmitter may be calibrated to 0.2-1.0 kgf/
cm
2
, 20-100 kPa, 0.2-1.0 bar, or 3-15 psi signal
pressure range. These four ranges are not exactly
equivalent; therefore the transmitter must be
calibrated to the same signal pressure range as the
receiver with which it is used.
5.1.1 Calibration Equipment
F0501.ai
Pressure
B
A
Vacuum
0-1.5 kgf/cm
2
or bar, 0-150 kPa, or
0-22 psi Test gauge (or manometer)
Pneumatic
Lock in desired pressure or vacuum with valve A.
Reduce by bleeding at B.
F0502.ai
Dead
weight
tester
Weights
Hydraulic
(required with high pressures)
Increase pressure with crank until pressure
supports an accurately-known weight. Accurate test
gauge may be used with hydraulic pump in a similar
set up.
Figure 5.1
Calibration Equipment
5.1.2 Calibration Procedure
Step 2, 4 and 5 in procedure below pertain only
to transmitters with elevated or suppressed zero
ranges. Illustrations for these steps show zero
suppression kit. If transmitter has zero elevation
kit, location of the 2 screws mentioned is reversed.
If transmitter has neither elevated nor suppressed
zero range, skip these steps.
1. Set up calibration equipment (Refer to section
5.1.1).
Check overrange stop adjustment (Refer to
section 5.1.5).
2. If transmitter has elevated or suppressed zero
range, disconnect spring from force bar as
follows.
F0503.ai
A. Remove screw from end of spring.
Bracket
B. Turn adjustment screw clockwise
until spring is clear of bracket.
Spring must not bind against
flapper or casting.
3. With no pressure on transmitter, adjust zero
screw so that output on test gauge reads 0.2
kgf/cm
2
or bar, 20 kPa, or 3 psi.
If screw was removed in Step 2-A, replace it.
F0504.ai
Zero screw
