Estimation of Calibration Values of Quartz Bourdon-Type Pressure Transducers Using Various Gases

摘要

Quartz Bourdon-type pressure transducers are used as a secondary standard for high-pressure precision measurements. Such a transducer's calibration value depends on the pressure medium. When employing a pressure transducer for precision measurements using high-pressure gases, the calibration value should be corrected depending on the gas used. Herein, we describe a method for correcting the transducer's calibration values based on the gas density. We evaluate the relationship between the level of variation of the calibration value and the density using six types of gases, at pressures up to 100 MPa. The level of variation was determined using the difference between the calibration values obtained when the device was oriented vertically upward and downward. The density of high-pressure gases was measured in situ by measuring the head differential pressure. The level of variation of the calibration value was proportional to the density, regardless of the gas employed. Thus, we demonstrated a method for correcting the calibration value. The uncertainty of the correction was found to be sufficiently smaller than that of the calibration value. Therefore, once the relationship is determined, the calibration value for any gas can be estimated from its respective density without a substantial increase in uncertainty.