71X Series
Calibration Manual
48
1. Carefully attach the pressure fitting of the deadweight tester to the pressure port of
the Calibrator.
Note
The use of TEFLON tape at the pressure fitting strengthens the seal.
2. Press the green O key to turn the calibrator on.
3. The display should read 0.00 PSI with the deadweight tester opened up to ambient
air. If not, press the
Z key until display does read 0.00 PSI.
4. Depending if the instrument being tested is a 718(Ex) 1G, 30G, 100G, 300G, set up
the deadweight tester for the sequence of PSI inputs from Table 68 to be injected into
the pressure port of the Calibrator.
5. Ensure the pressure has stabilized at each input before verifying the display reading.
6. Carefully vent all pressure and disconnect the calibrator from the deadweight tester.
Note
When verifying vacuum pressure make sure the pressure/vacuum switch is
in the vacuum position. Forward (clockwise) is for pressure and backward
(counter-clockwise) is for vacuum.
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