THE NATIONAL STANDARD GAS PROVERS OF THE IMGC-CNR |
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| G. Cignolo, A. Rivetti, G. Martini, F. Alasia, G. Birello, G. La Piana |
- Abstract:
- A small bell prover and a piston prover of large capacity recently installed in the new Gas Flow Laboratory of the IMGC-CNR (the national primary standards laboratory in Italy for mechanical and thermal quantities) are described. The provers have been completely revised, automated and equipped with state-of-the-art instrumentation for measurement of temperature, pressure, bell or piston displacement and time.
Both provers have been calibrated again soon after installation in the new laboratory and have been used successfully in two EUROMET comparisons carried out in 1998. The paper describes the adopted calibration methods and their results. The uncertainty budgets are given and discussed. The expanded uncertainty (k = 2) of the bell prover can be as low as 0.1% when its full capacity is used.
Thanks to the design criteria selected when constructing the larger prover (that is equipped with a piston of 1000 mm diameter) the mere “volumetric” uncertainty of the piston prover is an order of magnitude lower than that of any bell prover. Therefore, the expanded uncertainty associated with the volumes of gas delivered at the test point ranges between 0.01% and 0.1%, being almost completely dependent upon the stability of temperatures and pressures. - Keywords:
- gas, prover, measurement, standard, calibration, flowmeter, meter
- Download:
- IMEKO-TC9-2000-068.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2000
- Title:
- 10th Conference on Flow Measurement
- Place:
- Salvador, Bahia, BRAZIL
- Time:
- 04 June 2000 - 08 June 2000