A Low-pressure non-rotating new piston gauge covers the range of gauge and absolute pressure from less than 1 Pa to 15 kPa in gas media [1]. The instrument operates on the piston gauge principle. However, the force resulting from pressure on the piston is measured by a force balanced load cell rather than a balanced system against masses subjected to the acceleration due to gravity. For this reason, the measuring portion is designated a force balanced piston gauge (FPG) [1]. While pressure measurement range of a conventional pressure balance can start from around 5 kPa, as the FPG can measure pressure starting from a few pascal. Calibration or determination of the effective area of FPG system can be done using a conventional pressure balance reference instrument gauge in gauge and absolute modes. This paper describes the metrological characterization of a low-pressure non-rotating piston-cylinder unit both in absolute and gauges pressure modes, in the range of 1 Pa to 15 kPa by direct comparison method.
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