Investigation of the Equivalence of National Dew-Point Temperature Realizations in the ?50?°C to +?20?°C Range |
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Authors: | Martti Heinonen Miltiadis Anagnostou Stephanie Bell Mark Stevens Robert Benyon Reidun Anita Bergerud Jovan Bojkovski Rien Bosma Jan Nielsen Norbert B?se Plunkett Cromwell Aliye Kartal Dogan Seda Aytekin Ali Uytun Vito Fernicola Krzysztof Flakiewicz Bertrand Blanquart Domen Hudoklin Per Jacobson Anders Kentved Isabel Lóio George Mamontov Alexandra Masarykova Helmut Mitter Regina Mnguni Jan Otych Anton Steiner Nagyné Szilágyi Zsófia Davor Zvizdic |
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Affiliation: | 1. Centre for Metrology and Accreditation (MIKES), Espoo, Finland 2. Hellenic Institute of Metrology (EIM), Thessaloniki, Greece 3. National Physical Laboratory (NPL), Teddington, UK 4. Instituto Nacional de T??cnica Aeroespacial (INTA), Madrid, Spain 5. Norwegian Metrology Service (JV), Oslo, Norway 6. MIRS/UL/FE-LMK, Ljubljana, Slovenia 7. VSL, Delft, The Netherlands 8. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany 9. National Metrology Laboratory (NML), Dublin, Ireland 10. Ulusal Metroloji Enstit??s?? (UME), Gebze Kocaeli, Turkey 11. Istituto Nazionale di Ricerca Metrologica (INRiM), Turin, Italy 12. Central Office of Measures (GUM), Warszawa, Poland 13. Centre Technique des Industries A??rauliques et Thermiques (CETIAT), Lyon, France 14. Swedish National Testing and Research Institute (SP), Bor?s, Sweden 15. Danish Electronics Light & Acoustics (DELTA), Hoersholm, Denmark 16. Instituto Portugu??s da Qualidade (IPQ), Lissabon, Portugal 17. D. I. Mendeleyev Institute for Metrology (VNIIM), St. Petersburg, Russia 18. Slovak Institute of Metrology (SMU), Bratislava, Slovakia 19. BEV/E+E Elektronik (BEV), Engerwitzdorf, Austria 20. National Metrology Institute of South Africa (NMISA), Pretoria, South Africa 21. Czech Metrology Institute (CMI), Brno, Czech Republic 22. Swiss Federal Office of Metrology (METAS), Bern, Switzerland 23. Hungarian Trade Licensing Office (MKEH), Budapest, Hungary 24. University of Zagreb, FSB-LPM, Zagreb, Croatia
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Abstract: | In the field of humidity quantities, the first CIPM key comparison, CCT-K6 is at its end. The corresponding European regional key comparison, EUROMET.T-K6, was completed in early 2008, about 4?years after the starting initial measurements in the project. In total, 24 NMIs from different countries took part in the comparison. This number includes 22 EURAMET countries, and Russia and South Africa. The comparison covered the dew-point temperature range from ?50?°C to +20?°C. It was carried out in three parallel loops, each with two chilled mirror hygrometers as transfer standards in each loop. The comparison scheme was designed to ensure high quality results with evenly spread workload for the participants. It is shown that the standard uncertainty due to the long-term instability was smaller than 0.008?°C in all loops. The standard uncertainties due to links between the loops were found to be smaller than 0.025?°C at ?50?°C and 0.010?°C elsewhere. Conclusions on the equivalence of the dew-point temperature standards are drawn on the basis of calculated bilateral degrees of equivalence and deviations from the EURAMET comparison reference values (ERV). Taking into account 16 different primary dew-point realizations and 8 secondary realizations, the results demonstrate the equivalence of a large number of laboratories at an uncertainty level that is better than achieved in other multilateral comparisons so far in the humidity field. |
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