Goody, B A; Milton, M J T (2002) High accuracy gas flow dilutor using mass flow controllers with binary weighted flows. Meas. Sci. Technol., 13. pp. 1138-1145.

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Abstract

A high accuracy gas flow dilutor has been developed using mass flow controllers operating at flow rates ordered in terms of factors of two. It uses a novel self-referencing calibration procedure to generate variable dilutions with a typical accuracy of ±0.4%. There is no requirement for calibration to any external standard of flow. A detailed analysis of the uncertainty of configurations giving constant total gas and constant complimentary gas flow is presented. Application of the the dilutor to the analysis of standard gas mixtures and to testing the linearity of gas analysers are demonstrated.

Item Type:	Article
Keywords:	gas flow dilutor, thermal mass flow controller, gas metrology, binary weighted flow
Subjects:	Analytical Science
Last Modified:	02 Feb 2018 13:17
URI:	https://eprintspublications.npl.co.uk/id/eprint/2377