PVTt primary flow standard for small gas flow rates

U. Primožič, G. Bobovnik, J. Kutin

Abstract

A PVTt primary flow standard operates on the principle of determining the change of density of the measured gas in the tank of a known volume and the corresponding time interval. The PVTt standard presented in this paper is based on the diverter-operated flying start and finish method. It contains the gas collection tank that is constructed as a dismountable assembly, which enables determining its internal volume by dimensional measurements. The standard is designed for the flow range from 0.12 mg/min to 12 mg/min and it achieves the relative expanded measurement uncertainty between 0.12% and 0.24%. We performed a comparison of the realized PVTt flow standard with the piston-prover flow standard for flow rates above 1.2 mg/min, and the results were found successful in view of normalized errors, En.

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IMEKO TC

TC9 - Flow Measurement

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