Work

Two primary standards for low flows of gases

Year: 2004

Type: article

Abstract: We describe two primary standards for gas flow in the range from 0.1 to 1000 μmol/s. (1 μmol/s ≅ 1.3 cm(3)/min at 0 °C and 1 atmosphere.) 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, which have standard uncertainties of 0.019 %, agree to within combined uncertainties with each other and with a third primary standard at NIST based on pressure measurements at constant volume.

Source: Journal of Research of the National Institute of Standards and Technology

DOI: 10.6028/jres.109.031

Authors: R.F. Berg, S.A. Tison

Institutions: National Institute of Standards and Technology, Cordis US Corp. (United States)

Language: English

Topic: Scientific Measurement and Uncertainty Evaluation

Subfield: Statistics, Probability and Uncertainty

Field: Decision Sciences

Domain: Social Sciences

Open Access status: bronze

Funder: National Institute of Standards and Technology

OpenAlex ID: W2312697242

FWCI: 2.546

Cites: 6

Cited by: 18

Related to: 10