A Large Area Piston Gauge for Differential and Gauge Pressure from Zero to 3,2 kPa

Abstract

The FRS4 pressure balance, or piston gauge, extends the range of this type of instrument below the usual minimum of 1,5 kPa. It gives 0,001 Pa resolution from 0,000 Pa to 1 kPa and 0,01 Pa to 3,2 kPa. This is achieved using a piston with an effective area of 100 cm 2 . A novel mechanism holds the piston centrally in the cylinder without friction and without the necessity of rotation. The piston assembly is mounted on an electronic balance giving direct continuous readout in pascals. Calibration is by direct measurement to calculate effective area and by standard certified weights to characterize the electronic balance. The uncertainty is ± 0,002 Pa ± 0,003% of reading from 0,000 Pa to 1 009,999 Pa, and ± 0,01 Pa ± 0,003% of reading from 1 010,00 Pa to 3 200,00 Pa.

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