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Title: Experiences With Use Of A Gravimetric Flow Standard In Vacuum
Author: Denek Krajicek Dominik Prak Martin Vicar Jiri Tesar Ladislav Peksa Tom Gronych Martin Jerb
Source: Flomeko 2016
Year Published: 2016
Abstract: The range of the low gas flow (litres per minute at the standard conditions and lower) are of increasing importance which must be reflected by the national metrology institutes. The Czech national standard of low gas flow is based on a gravimetric flow sta ndard (GFS) principle. Hence this instrument defines the flow as a time function of a loss of gas from a pressure bottle which is continuously weighed. This weighing is performed in ambient air causing that the main source of uncertainty results from the b uoyancy correction. A precise determination of this correction is complicated by the instabilities of the atmospheric environment and by a fact that volume of the weighed pressure bottle is dependent both on temperature and internal pressure

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