Calibration values uninfluenced by the kind of pressure medium and the setting posture for quartz Bourdon-type pressure transducers
The effects of the kind of gas medium and the setting posture on the calibration values of a quartz Bourdon-type pressure transducer mounted vertically are evaluated in this study. The transducer, at the upward and downward settings, was calibrated both with nitrogen and with helium. The difference between the calibration values of the transducer with nitrogen at the upward and downward settings was about 7.0 kPa at 100 MPa. At the same setting posture, the maximum difference in the calibration values between nitrogen and helium was 3.4 kPa. For precise pressure measurement, it is recommended that the transducers are used with the same pressure medium and the same setting posture with which they were calibrated. The methods of reducing the effects of both the kind of gas medium and the setting posture are discussed. The average of two calibration values at the upward setting and at the downward setting was not affected by the kind of gas medium. When the sensing elements of two pressure transducers arranged in point symmetry with each other, the average values of two transducers were independent of both the kind of gas medium and the setting posture.
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