18
Section 3
Model 763A Gage Pressure Transmitter
6. Apply 50% calibration pressure. Check that the output is within Table 3.1
7. If the proper output is not obtained in step 6, recalibrate according to the
calibration procedure on
page 19
or return the transmitter to the factory.
8. Replace the calibration access plugs as follows (or if the cover has no
calibration access plugs and was removed, see
page 21
for instructions on
replacing the cover).
a. Replacement of the calibration plug O-rings is recommended (coat
with a small amount of silicone grease). If the O-rings cannot be
replaced, inspect the ring surface to verify that the ring surfaces have
no damage and coat them with a small amount of silicone grease
before reinstalling.
b. Install the calibration plugs.
c. Tighten the plugs until they are snug (no applicable torque values).
IMPORTANT: The plugs should be tightened only to prevent loosening due to vibration
without interfering with zero and span potentiometer adjustments.
Startup Procedure
To operate the transmitter, perform the following steps. See Figure 3.1,
page 12
,
for valve locations.
1. Close the transmitter shut-off valves.
2. Close the transmitter drain valves and calibration connection valves.
3. Open the main block valves at the process connections.
4. Slowly open the transmitter shut-off valves.
5. Apply electrical power to the transmitter loop.
Shutdown Procedure
To shut down operations, perform the following steps. See Figure 3.1,
page 12
,
for valve locations.
1. Remove electrical power from the transmitter loop.
2. Close the transmitter shut-off valves.
3. Close the main block valves at the process connections.
4. Open the transmitter drain valves and remove all pressure from the unit.
www.ittcontrols.com