Abstract：Based on the transducer-aided crossfloat (TAC) method, an automated calibration system for piston gauges has been developed and improved. The components and function of the calibration software based on the LabVIEW are introduced. The reliability of applying the automated calibration system on the dissemination of primary standard for pneumatic piston gauges is studied by comparison test against the traditional crossfloat method (CF). The transducer coefficient (γ) could be treated as 1 if the deviation is so small that the product of the deviation and the relative pressure difference (β) is less than 10-6. For the counter-pressure pneumatic piston gauges with the measurement upper limit of 7MPa, the fitting data of the full-scale and half-scale indicate that the pressure deformation of the piston has a certain degree of nonlinearity, so full-scale calibration should be carried out for the high-pressure piston; The thermal effect of the PG7607 piston base causes a piston temperature measurement error of 0.33 ℃, resulting in a pressure measurement error of 3×10-6, which is non-negligible for the primary standard; The calibration results for the 180kPa, 360kPa and 3MPa piston gauges determined by the automated system and the traditional method differ from each other are about 10%, 1% and 2% of the standard uncertainty, which verify the high reliability of the automated calibration system.
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2021, Vol. 42 
