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A dynamic gravimetric standard for trace water.

Brewer, P J; Goody, B A; Woods, P T; Milton, M J T (2011) A dynamic gravimetric standard for trace water. Rev. Sci. Instrum., 82 (10). 105102

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Abstract

A system for generating traceable reference standards of water vapor at trace levels between 5 - 2000 nmol/mol has been developed. It can provide different amount fractions of trace water vapor by using continuous accurate measurements of mass loss from a permeation device coupled with a dilution system based on an array of critical flow orifices. An estimated relative expanded uncertainty of ±2 % has been achieved for most amount fractions generated. The system has been used in an international comparison and demonstrates excellent comparability with national metrology institutes maintaining standards of water vapor in this range using other methods.

Item Type: Article
Subjects: Analytical Science
Analytical Science > Gas Standards
Identification number/DOI: 10.1063/1.3642660
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/5313

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