T Gronych et al 2008 Metrologia 45 46 doi:10.1088/0026-1394/45/1/007
T Gronych1, L Peksa1, P Repa1, J Wild1, J Tesař2, D Pražák2, Z Krajíček2 and M Vičar2
Show affiliationsA constant pressure gas flowmeter using a directly driven diaphragm bellows as a volume displacer was studied. This flowmeter is perfectly vacuum-sealed, does not contain elastomers and liquids that would prevent outgassing at elevated temperatures and can achieve a smaller ratio of the final volume to the displaced volume than when bellows are used, so that the uncertainty in generating small flow rates can be small. As, when a bellows is used in the volume displacer, the displaced volume cannot be calculated from the geometric dimensions and its dependence on the displacement is non-linear, a sensitive method had to be developed for measuring this dependence. The uncertainty in measuring the displaced volume by this method and the achieved uncertainty of the flowmeter were determined.
Issue 1 (February 2008)
Received 19 March 2007
Published 18 December 2007
T Gronych et al 2008 Metrologia 45 46
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