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An interlaboratory comparison of relative humidity and temperature probes using diverse generation techniques.

Gee, R M*; Farley, R S*; Sax, P*; Benyon, R*; Stevens, M; Bose, N* (2008) An interlaboratory comparison of relative humidity and temperature probes using diverse generation techniques. Int. J. Thermophysics, 29 (5). pp. 1696-1708.

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Abstract

An interlaboratory comparison using relative humidity (RH) and temperature probes at three National Measurement Institutes and two accredited laboratories has been carried out. The work had three purposes, firstly to establish the instrument's level of reproducibility and suitability for use as transfer standards within their specified range of operation. Secondly to show agreement of a method of RH generation utilising certified non-saturated salt relative humidity standards when compared with a method of RH calibration using a chilled mirror reference and Platinum Resistance Thermometers (PRTs). Finally, form the results obtained it is possible to establish the equivalence between the participating laboratories, to the level of uncertainty achievable with the transfer standards used.

A total of six RH probes were tested in two groups. The instruments of the first group were calibrated in the range from 10 %rh to 90 %rh at a temperature of 23 ºC. The second group of instruments were measured in the same relative humidity range, but at temperatures of 5 ºC, 23 ºC and 50 ºC. The objective of the tests on the second group of instruments was to determine the effect of a wider operating temperature range on performance.

The paper presents and discusses the results of the comparison in the context of an international collaboration that provides confidence in the measurements performed by the participants within their respective accredited scopes and the ILAC [1, 2] or the CIPM [3] Mutual Recognition Arrangements (MRA).

Item Type: Article
Keywords: comparison, interlaboratory, relative humidity
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/5086

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