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| A New Method for Low Differential Gauge Pressure MeasurementBased on Piston Guage and Digital Pressure Gauge |
| LI Yan-hua1,SUN Jun-feng2 |
1. National Institute of Metrology, Beijing 100013, China
2. Jilin Institute of Metrology, Changchun, Jilin 130022, China |
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Abstract A method for measuring the low differential or gauge pressure with the combination of a piston gauge (PG), a digital pressure gauge (DPG) and a special connected way of a bypass is described. The problem of the lower pressure limit due to the load mass of the piston itself is solved. By the advantage of perfect short-term stability of the DPG and the lower uncertainty of the PG, the differential pressure or gauge pressure up to 10kPa could be measured, the expanded uncertainty of the measurement is 2.2Pa with k=2.
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2012, Vol. 33 
