Chattle, M V; Butler, J (1994) BIPM project: intercomparison of water triple point cells. NPL Report. QU 104

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Abstract

The paper presents the results of an intercomparison between 3 triple point of water cells circulated by the Bureau International des Poids et Mesures (BIPM), and a cell which is one of those used as a reference cell at the National Physical Laboratory. All 4 cells were prepared, stored and measured in the manner normally adopted at NPL.
The results of the intercomparison show that over the course of about 6 weeks the temperatures of the 3 circulated cells generally agreed within 0.20 mK, with a maximum difference of 0.277 mK. Over the same period, the total variations of temperature measured in the 3 individual cells were 0.04 rnk, 0.08 mK and 0.18 mK, respectively; the NPL cell varied by 0.10 mK. Gallium point measurements made over a similar period confirmed that these differences were partly due to small drifts in the thermometer resistance or in the measuring system.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	QU 104
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Last Modified:	02 Feb 2018 13:19
URI:	https://eprintspublications.npl.co.uk/id/eprint/87