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Title: Two Primary Standards For Low Flows Of Gases
Author: Robert F. Berg,Stuart A.Tison
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: We describe two primary standards for gas flow in the range from 0.1 to 1000 mol/s. (1 mol/s 1.3448 standard cubic centimeters per minute.) The first standard is a volumetric technique in which measurements of pressure, volume, temperature, and time are recorded while gas flows in or out of a stainless steel bellows at constant pressure. The second standard is a gravimetric technique. A small aluminum pressure cylinder supplies gas to a laminar flow meter, and the integrated throughput of the laminar flow meter is compared to the weight decrease of the cylinder. The two standards differ by approximately 0.06 %. Although this exceeds the combined standard uncertainty of 0.04 %, it suggests that the error of both standards is less than 0.06 %.

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