P P M Steur and R Dematteis 2008 Metrologia 45 529 doi:10.1088/0026-1394/45/5/006
P P M Steur and R Dematteis
Show affiliationsInstabilities of the order of 50 µK 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.
06.20.fb Standards and calibration
06.30.Bp Spatial dimensions (e.g., position, lengths, volume, angles, and displacements)
Issue 5 (October 2008)
Received 18 January 2008
Published 17 September 2008
P P M Steur and R Dematteis 2008 Metrologia 45 529
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