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Title: Uncertainty Of The Critical Venturi Transfer Standard Used In The K6 Gas Flow Key Comparison
Author: John D. Wright
Source: Flomeko 2007
Year Published: 2007
Abstract: The uncertainty of a critical flow venturi (CFV) gas flow transfer standard with dedicated, redundant pressure and temperature instrumentation is analyzed. At lower flows (5 g/min), the standard uncertainty of the transfer standard was 0.026 %. At higher flows (200 g/min), the standard uncertainty was 0.019 %. The largest uncertainty components were: 1) environmental temperature effects, 2) pressure sensors, and 3) the critical flow function. Temperature effects for the CFV transfer standard resulted from: 1) temperature sampling errors, 2) thermal boundary layers, and 3) thermal expansion of the CFV throat. Temperature effects on small CFVs were more significant than for large CFVs.

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