Martin, N A; Goody, B A; Wang, J; Milton, M J T (2012) Accurate and adjustable calibration gas flow by switching permeation and diffusion devices. Meas. Sci. Technol., 23 (10). 105005

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Abstract

A new method for generating adjustable concentrations of calibration gases from permeation and diffusion devices is described. The method achieves high accuracy by maintaining the source device at a constant temperature and pressure and in a constant gas flow. It involves switching the gas stream and subsequently smoothing it to generate dilutions of up to 100 with a relative uncertainty of ± 2%. Its dynamic performance has been modelled and its performance under steady-state conditions has been validated.uncertainty of ± 2%. Its dynamic performance has been modelled and its performance under steady-state conditions has been validated.

Item Type:	Article
Subjects:	Analytical Science Analytical Science > Gas Standards
Identification number/DOI:	10.1088/0957-0233/23/10/105005
Last Modified:	02 Feb 2018 13:14
URI:	https://eprintspublications.npl.co.uk/id/eprint/5561