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Calibration and Verification Teledyne API T703/T703U Calibrator Operation Manual
138
6.3. CALIBRATING GAS PRESSURE SENSORS
The T703 Calibrator has two sensors that monitor the pressure of the gases flowing
through the instrument: a Regulator pressure sensor and a Photometer Sample Gas
pressure sensor. The T703U also has those two sensors plus one more: an O
3
Generator
Regulator pressure sensor. The data collected by these sensors are used to compensate
the final concentration calculations for changes in atmospheric pressure and are stored in
the CPU’s memory as test functions:
Table 6-1: T703/T703U Pressure Sensors
SENSOR
ASSOCIATED
TEST FUNCTION
UNITS
PRESSURE MONITOR
MEASUREMENT POINT
Regulator Pressure Sensor
REG PRESSURE PSIG
Capped fitting on backside of regulator
assembly. See Figure 6-5.
Photometer Sample Gas
Pressure Sensor
PHOTO SPRESS IN-HG-A
Use monitor to measure ambient
atmospheric pressure at the calibrator’s
location.
(T703U only) O
3
Generator
Regulator Pressure Sensor
O3 PRES PSIG
Capped fitting on O
3
Generator Regulator
assembly. See Figure 6-6.
6.3.1. GAS PRESSURE SENSOR CALIBRATION SET UP
The procedures described in this section require an independent, calibrated pressure
meter/monitor to be attached at the location shown in Figure 6-3 for T703, or at the
locations shown in Figure 6-4 for T703U.
Figure 6-3: Pressure Calibration Monitor Point – T703
07223C DCN6572