Phenomenological Model for the Extended Cross-Float Method

A. Brzozowskia, R. Szewczykb, P. Gazdab, M. Nowickic aCentral Office of Measures, Elektoralna 2, 00-139 Warsaw, Poland bInstitute of Metrology and Measuring Systems, Faculty of Mechatronics, Warsaw University of Technology, św. A. Boboli 8, 02-525 Warsaw, Poland cDepartment of Mechatronics, Robotics and Digital Manufacturing, Faculty of Mechanics, Vilnius Gediminas Technical University, Plytinės g. 25, LT-10105 Vilnius, Lithuania

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Deadweight piston gauges are vital for metrology and calibration, with their effective area traditionally determined through labour-intensive methods or precise geometric measurements. This paper introduces an extended cross-float method that simplifies effective area determination by avoiding detailed equilibrium point adjustments. The proposed method uses dynamic displacement data instead of static comparisons, potentially improving calibration efficiency. Experiments using laser sensors revealed a clear link between fall rate variations and mass discrepancies, emphasising the need for consistent reference levels. While the extended method shows promise, further research is necessary to address the impact of variables like piston temperature, rotation speed, and air density, particularly for high-pressure and gaseous systems.

DOI:10.12693/APhysPolA.146.462 topics: cross-float method, pressure balance calibration, piston fall rate, effective area calibration