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Title: A New Pvtt Primary Gas Flow Standard At Cms
Author: Ching-Yi Kuo Yi-Lin Ho Wen-Ti Lin Chun-Min Su
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: Center for Measurement Standards (CMS) has finished constructing a new pressure, volume, temperature, and time (PVTt) primary gas flo w standard at the end of 2013. The PVTt gas flow standard spans the flow range of 0.01 L/mi n to 300 L/min using three gas collection tanks with an expanded uncertainty ( k 2) of 0.10 %. Each gas collection tank has an in dividual three-way diverter valve composed of a specially-des igned reduced-bore ball valve and a pneumatic cylinder. The collection tanks are immerse d in a circulated water bath and the uncertainty of the collected gas temperature after ac hieving thermal equilibrium is 0.05 K. The design of this flow standard and the strategy to redu ce the uncertainty of the flow measurements are introduced in this paper. In addit ion, an intra-comparison between the PVTt gas flow standard and the existing three other prima ry gas flow standards, i.e. a piston prover and two bell provers, were conducted. Results showe d the three systems agreed within deviation of 0.05 %

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