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Title: Critical Flow Venturi Manifold Improves Gas Flow Calibrations
Author: Aaron N. Johnson, Chunhui Li, John D. Wright, Gina m. Kline, And Chris J. Crowley
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: We developed a critical flow venturi (CFV) manifold that reduced the uncertainty of flow calibrations from 0.09 % to as low as 0.074 % (at a 95 % confidence level) for flows of air up to 0.84 kg/s (43 000 L/min at reference conditions of 101.325 kPa and 293.15 K). The CFV manifold also reduced the time required to complete calibrations by a factor of 10. Each CFV was installed in the manifold after it was calibrated in dry air using NISTs 677 L PVTt standard with an uncertainty in mass flow of 0.025%. The CFV manifold is used to calibrate customer flow meters at flows up to 21 times the flow of a single CFV. We demonstrate that interference effects between the CFVs in the manifold are negligible and we provide an uncertainty analysis of the CFV array working standard. We used the CFV array as a transfer standard to demonstrate the metrological equivalence of NISTs 677 L and 26 m3 PVTt standards, which agreed to better than 0.059 %.

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