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Establishment of a New National Reference Ensemble of Water Triple Point Cells

  • Remo SennEmail author
TEMPMEKO 2016
  • 96 Downloads
Part of the following topical collections:
  1. TEMPMEKO 2016: Selected Papers of the 13th International Symposium on Temperature, Humidity, Moisture and Thermal Measurements in Industry and Science

Abstract

The results of the Bilateral Comparison EURAMET.T-K3.5 (w/VSL, The Netherlands) with the goal to link Switzerland’s ITS-90 realization (Ar to Al) to the latest key comparisons gave strong indications for a discrepancy in the realization of the triple point of water. Due to the age of the cells of about twenty years, it was decided to replace the complete reference ensemble with new “state-of-the-art” cells. Three new water triple point cells from three different suppliers were purchased, as well as a new maintenance bath for an additional improvement of the realization. In several loops measurements were taken, each cell of both ensembles intercompared, and the deviations and characteristics determined. The measurements show a significant lower average value of the old ensemble of \(0.59 \pm 0.25\hbox { mK }(k=2)\) in comparison with the new one. Likewise, the behavior of the old cells is very unstable with a drift downward during the realization of the triple point. Based on these results the impact of the new ensemble on the ITS-90 realization from Ar to Al was calculated and set in the context to performed calibrations and their related uncertainties in the past. This paper presents the instrumentation, cells, measurement procedure, results, uncertainties and impact of the new national reference ensemble of water triple point cells on the current ITS-90 realization in Switzerland.

Keywords

Calibration ITS-90 National reference water triple point cells 

References

  1. 1.
    H. Preston-Thomas, The international temperature scale of 1990 (ITS-90). Metrologia 27, 3 (1990)ADSCrossRefGoogle Scholar
  2. 2.
    A. Peruzzi, C. Bruin-Barendregt, R. Bosma, R. Senn, Final report on EURAMET.T-K3.5: Bilateral comparison of SPRT calibration at the ITS-90 Fixed Points of Ar, Hg, H 2 O, Ga, In, Sn, Zn and Al. Metrologia 51, 3001 (2014)ADSCrossRefGoogle Scholar
  3. 3.
    K.D. Hill, Is there a long-term drift in triple point of water cells? Metrologia 38, 79 (2001)ADSCrossRefGoogle Scholar
  4. 4.
    M. Zhao, G.F. Strouse, VSMOW triple point of water cells: borosilicate versus fused-quartz. Int. J. Thermophys. 28, 1923–1930 (2007)ADSCrossRefGoogle Scholar
  5. 5.
    G.F. Strouse, M. Zhao, The impact of isotopic concentration, impurities, and cell aging on the water triple-point temperature. Int. J. Thermophys. 28, 1913–1922 (2007)ADSCrossRefGoogle Scholar
  6. 6.
    A. Peruzzi, R. Bosma, O. Kerkhof, R. Peter, M.D. del Campo Maldonado, M. Smid, D. Zvizdic, M.B. Nielsen, M. Anagnostou, E. Grudnewicz, M. Nedea, P.P.M. Steur, E. Filipe, I. Lobo, I. Antonsen, E. Renaot, T. Weckstrom, J. Bojkovski, E. Turzó-András, M. White, E. Tegeler, M. Dobre, J. Ranostaj, A. Kartal Dogan, V. Augevicius, A. Pokhodun, S. Simic, Final Report on EUROMET.T-K7: key comparison of water triple point cells. Metrologia 46, 3001 (2009)ADSCrossRefGoogle Scholar
  7. 7.
    Report of CIPM 24th meeting: recommendation 2. (2005)Google Scholar
  8. 8.
    M. Dobre, Implementing a new group of TPW cells as national standard: impact on calibration services. Int. J. Thermophys. 29, 799–807 (2008)ADSCrossRefGoogle Scholar
  9. 9.
    D.R. White, M. Ballico, V. Chimenti, S. Duris, E. Filipe, A. Ivanova, A. Kartal Dogan, E. Mendez-Lango, C. Meyer, F. Pavese, A. Peruzzi, E. Renaot, S. Rudtsch, K. Yamazawa, Uncertainties in the realization of the SPRT subranges of the ITS-90. [Online]. http://www.bipm.org/cc/CCT/Allowed/24/Uncert_CCT-08-19-rev-2014-01-24.pdf (2008)
  10. 10.
    A. Steiner, G. Zwahlen, W. Münch, Quality control of sealed metal fixed point cells, in Proceedings TEMPMEKO 2001, Berlin, pp. 795–800 (2002)Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.Designated Institute for Temperature ROTH+CO. AGOberuzwilSwitzerland

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