<5. Maintenance>
5-3
IM 02C01B04-01EN
5.1.4 Flexure Cap Screw Adjustment
This adjustment should be made if the capsule has
been replaced, or the cap screw loosened.
1. Set up calibration equipment (Refer to section
5.1.1).
2. Disconnect zero elevation or zero suppression
attachment as discribed in Step 2 of Calibration,
(Refer to section 5.1.2).
3. Vent pressure connection to the transmitter.
4. Loosen flexure locknut using 9/64" hex-key
wrench.
5. With no pressure on transmitter, adjust zero
screw for 0.2 kgf/cm
2
or bar, 20 kPa, or 3 psi
output.
6. Carefully tighten flexure cap screw and observe
output.
If output change is less than 0.014 kgf/cm
2
or
bar, 1.4 kPa, 0.2 psi, readjust zero screw to
bring output to 0.2 kgf/cm
2
or bar, 20 kPa, or 3
psi.
If output change is greater than 0.014 kgf/cm
2
or bar, 1.4 kPa, or 0.2 psi, repeat Steps 4, 5 and
6. If change persists, check capsule installation
(Reter to section 5.6), then repeat Flexure Cap
Screw Adjustment.
7. Calibrate transmitter.
F0509.ai
Hex-key wrench
Zero screw
Figure 5.3
Flexure Cap Screw Adjustment
5.1.5 Overrange Stop Adjustment
The overrange stop prevents damage to both the
flapper-nozzle and the dashpot. Before calibrating,
check that the stop is correctly adjusted.
IMPORTANT
Do not move the force bar if the overrange stop is
loose or disconnected.
1. Turn on air supply. Apply pressure to transmitter
so that output is stabilized at a value between
0.2 and 1.0 kgf/cm
2
or bar, 20 and 100 kPa, or 3
and 15 psi.
2. Clearance between both sides of overrange
stop (U-shaped bracket) and plate to be
sufficient to permit sliding piece of paper
between them.
3. If not, loosen screws with 3/32" hex-key wrench
and reposition stop to get correct clearance.
Retighten screws.
F0510.ai
Overrange stop
Screw
4. With zero elevation kit, loosen lockscrew with
3/32" hex-key wrench. Hold eccentric pin in
correct position with open-end wrench and
tighten lockscrew.
F0511.ai
Overrange stop
Instrument
with Zero Elevation Kit
Instrument
with Zero Suppression Kit
4.
