The use of bushings with triple point of water cells: towards breaking the 50 µK barrier

Instabilities of the order of 50 ...K or higher have been observed in water triple point cells with a thermometer well of 12 mm to 13.6 mm diameter during measurements at the INRiM in the framework of the Euromet.T-K7 comparison. In the course of many follow-up measurements, extending over more than...

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Bibliographic Details
Published in:Metrologia 2008-10, Vol.45 (5), p.529-533
Main Authors: Steur, P P M, Dematteis, R
Format: Article
Language:English
Subjects:
Cells
Measurement techniques
Quartz
Temperature
Thermometers
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Summary:Instabilities of the order of 50 ...K or higher have been observed in water triple point cells with a thermometer well of 12 mm to 13.6 mm diameter during measurements at the INRiM in the framework of the Euromet.T-K7 comparison. In the course of many follow-up measurements, extending over more than one year, these anomalies have been investigated and a solution has been tried and verified. The use of quartz bushings has been tried, leading to a much closer agreement between water triple point cells of different dimensions than was hitherto achieved. Furthermore, the effect on the realized triple point temperature is shown, when no bushing is used. (ProQuest: ... denotes formulae/symbols omitted.)
ISSN:0026-1394
1681-7575
DOI:10.1088/0026-1394/45/5/006