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Title: Intercomparison Of Bell Provers Using Sonic Nozzles
Author: Kyung-Am Park, Hae Man Choi, Jiunn-Haur Shaw Denis Boam Jiuan C. Gervacio
Source: 2006 International Symposium on Fluid Flow Measurement
Year Published: 2006
Abstract: An intercomparison exercise was conducted to confirm the uncertainty of gas flow measurement using bell provers. Four national metrology institutes (KRISS, NEL, CENAM and CMS) participated in the exercise, which was organized by KRISS. A sonic nozzle package was developed as a transfer standard to do the intercomparison. Three sonic nozzles were tested at stagnation pressures of 0.3, 0.4 and 0.5 MPa. The sonic nozzles were installed upstream of the bell prover using inlet and outlet tube sections provided with the nozzle holder. The discharge coefficients of the sonic nozzles were compared as a function of Reynolds number. At low flow rates the differences between results from individual laboratories and the average was small. However, at the highest flow rates, the differences were, in some cases, larger than the expected value from uncertainties claimed for the measurements.

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