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International Journal of Thermophysics

, Volume 28, Issue 6, pp 1964–1975 | Cite as

Intercomparison of the Realization of the ITS-90 at the Freezing Points of Al and Ag among European NMIs

  • D. Heyer
  • U. Noatsch
  • E. Tegeler
  • M. Anagnostou
  • E. Turzo-Andras
  • I. Antonsen
  • V. Augevicius
  • J. Bojkovski
  • A. Bronnum
  • V. Chimenti
  • S. Duris
  • E. Filipe
  • S. Gaita
  • J. Gray
  • D. Head
  • E. Grudniewicz
  • J. Ivarsson
  • M. Kalemci
  • O. Kerkhof
  • I. Lobo
  • S. Nemeth
  • A. Pokhodun
  • J. Ranostaj
  • E. Renaot
  • P. Rosenkranz
  • M. Smid
  • P. Steur
  • A. Steiner
  • M. Valin
  • T. Veliki
  • T. Weckström
Article

Abstract

The EUROMET.T-K4 comparison is the regional extension of CCT-K4, an intercomparison of the realizations of the freezing points of Al (660.323°C) and Ag (961.78°C). The intercomparison was organized in four loops. Long-stem standard platinum resistance thermometers (SPRTs) were used as traveling standards: 25 Ω thermometers to be used only at the Al freezing point and two high-temperature standard platinum resistance thermometers (HTSPRTs) to be used only at the Ag freezing point in each loop. Parallel to the measurements with thermometers, the pilots and sub-pilots organized an internal intercomparison using an Ag fixed-point cell. Most HTSPRTs showed a strong drift which is mainly due to mechanical stress and poisoning of the sensor by impurities. This drift can be partially compensated by a correction based on Matthiessen’s rule. An evaluation of the data taking into account both HTSPRTs in each loop, the linkage of the sub-pilots by measurements at the Ag freezing point, and a possible compensation according to Matthiessens’s rule, allows calculation of the results of the participants’ measurements at the Ag freezing point. The results of the participating laboratories are summarized, and proposals for key comparison reference values and linking of the results to CCT-K3 and CCT-K4 are presented.

Keywords

Al freezing point Ag freezing point CCT EUROMET Fixed points High-temperature standard platinum resistance thermometers Key comparison Matthiessen’s rule 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • D. Heyer
    • 1
  • U. Noatsch
    • 1
  • E. Tegeler
    • 1
  • M. Anagnostou
    • 2
  • E. Turzo-Andras
    • 3
  • I. Antonsen
    • 4
  • V. Augevicius
    • 5
  • J. Bojkovski
    • 6
  • A. Bronnum
    • 7
  • V. Chimenti
    • 8
  • S. Duris
    • 9
  • E. Filipe
    • 10
  • S. Gaita
    • 11
  • J. Gray
    • 12
  • D. Head
    • 12
  • E. Grudniewicz
    • 13
  • J. Ivarsson
    • 14
  • M. Kalemci
    • 15
  • O. Kerkhof
    • 16
  • I. Lobo
    • 10
  • S. Nemeth
    • 3
  • A. Pokhodun
    • 17
  • J. Ranostaj
    • 9
  • E. Renaot
    • 18
  • P. Rosenkranz
    • 19
  • M. Smid
    • 20
  • P. Steur
    • 21
  • A. Steiner
    • 22
  • M. Valin
    • 18
  • T. Veliki
    • 23
  • T. Weckström
    • 24
  1. 1.Physikalisch-Technische Bundesanstalt (PTB)BerlinGermany
  2. 2.Hellenic Institute of Metrology (EIM)ThessalonikiGreece
  3. 3.National Office of Measures (OMH)BudapestHungary
  4. 4.National Standards Laboratory (Justervesenet)KjellerNorway
  5. 5.Temperature Standard Laboratory (VMT/PFI)VilniusLithuania
  6. 6.Laboratory of Metrology and Quality (MIRS/FE-LMK)LjubljanaSlovenia
  7. 7.Teknologisk InstitutAarhusDenmark
  8. 8.Centro Espanol de Metrologia (CEM)MadridSpain
  9. 9.Slovak Institute of Metrology (SMU)BratislavaSlovakia
  10. 10.Instituto Português da Qualidade (IPQ)CaparicaPortugal
  11. 11.Institut National de Metrologie (INM)BucarestRomania
  12. 12.National Physical Laboratory (NPL)TeddingtonUK
  13. 13.Central Office of Measures (GUM)WarsawPoland
  14. 14.Swedish National Testing and Research Institute (SP)BoråsSweden
  15. 15.Ulusal Metroloji Enstitsu (UME)Besevler, GebzeTurkey
  16. 16.National Metrology Institute (NMi)DelftThe Netherlands
  17. 17.D.I. Mendeleyev Institute of MetrologySt. PetersburgRussia
  18. 18.Institut National de Metrologie (LNE – INM/CNAM)ParisFrance
  19. 19.Bundesamt för Eich- und VermessungswesenWienAustria
  20. 20.Czech Metrology Institute (CMI)PrahaCzech Republic
  21. 21.Istituto Nazionale di Ricerca Metrologica (INRiM), (formerly Istituto di Metrologia (CNR))TorinoItaly
  22. 22.Federal Office of Metrology (METAS)BernSwitzerland
  23. 23.University of Zagreb (FSB-LPM)ZagrebCroatia
  24. 24.Centre for Metrology and Accreditation (Mikes)HelsinkiFinland

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