Berg, R.
and Tison, S.
(2002),
Two Primary Standards for Low Flows of Gases, International Symposium on Fluid Flow Measurement, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=830793
(Accessed October 9, 2025)
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Two Primary Standards for Low Flows of Gases
Published
Author(s)
, S A. Tison
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%.Citation
International Symposium on Fluid Flow Measurement
Volume
109 No. 4
Pub Type
Journals
Download Paper
Keywords
flow meter, gas flow, gravimetric, laminer flow meter, primary standard, volumetric
Citation
Issues
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Created September 1, 2002, Updated February 17, 2017