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Title: Revised Uncertainty Analysis Of NIST 26 m3 Pvtt Flow Standard
Author: Aaron Johnson, John Wright
Source: 2006 International Symposium on Fluid Flow Measurement
Year Published: 2006
Abstract: We re-analyze the uncertainty of NISTs 26 m3 pressure, volume, temperature, and time (PVTt) primary flow standard used to calibrate gas flow meters in the range 200 L/min to 77,000 L/min.1 During the past few years, this standard has been upgraded by improving measurements of gas temperatures and vacuum conditions within the collection tank, implementing a symmetric diversion process, and fully automating the calibration process. The upgrades reduced the expanded uncertainty of this standard, based on the GUM procedure, from 0.2 % to 0.09 % at the ninety-five percent confidence level (i.e., k 2) over the full flow range.

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