16
Section 3
Model 763A Gage Pressure Transmitter
Initial Calibration Adjustments
If a transmitter is installed after an extended period of storage, a calibration
test should be performed before operating the transmitter to ensure correct
performance.
Accuracy of the test equipment used for the calibration test should be ap-
proximately four times the accuracy of the instrument under test. See Table
4.1,
page 19
, for general requirements.
IMPORTANT: If there are no calibration access plugs in the cover, the cover must be
removed to adjust calibration. See Transmitter Cover Removal,
page 21
,
for instructions.
!
WARNING: Do not tamper with the Bourdon tube inside the enclosure
or the delicate wires connected to it (Figure 3.4). Improper handling can
damage connections and cause the transmitter to be inoperable.
WARNING:
Do not handle copper wires
Figure 3.4—Bourdon tube wiring (do not handle)
Calibration Check
The transmitter should be tested at minimum, maximum and 50% calibrated
range pressures for at least three cycles.
To test the transmitter calibration, perform the following steps:
1. Remove the calibration access plugs from the transmitter cover using a
socket or a wrench.
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