Investigation of the Equivalence of National Dew-Point Temperature Realizations in the -50 C to + 20 C Range

Martti Heinonen (Corresponding Author), Miltiadis Anagnostou, Stephanie Bell, Mark Stevens, Robert Benyon, Reidun Anita Bergerud, Jovan Bojkovski, Rien Bosma, Jan Nielsen, Norbert Böse, Plunkett Cromwell, Aliye Kartal Dogan, Seda Aytekin, Ali Uytun, Vito Fernicola, Krzysztof Flakiewicz, Bertrand Blanquart, Domen Hudoklin, Per Jacobson, Anders KentvedIsabel Lóio, George Mamontov, Alexandra Masarykova, Helmut Mitter, Regina Mnguni, Jan Otych, Anton Steiner, Nagyné Szilágyi Zsófia, Davor Zvizdic

    Research output: Contribution to journalArticleScientificpeer-review

    21 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)1422-1437
    Number of pages16
    JournalInternational Journal of Thermophysics
    Issue number8-9
    Publication statusPublished - 1 Sept 2012
    MoE publication typeNot Eligible


    • Degrees of equivalence
    • Dew-point temperature
    • Key comparison


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