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Investigation of the Equivalence of National Dew-Point Temperature Realizations in the -50 C to + 20 C Range
MIKES, Finland.
Hellenic Institute of Metrology, Greece.
NPL National Physical Laboratory, United Kingdom.
NPL National Physical Laboratory, United Kingdom.
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2012 (English)In: International journal of thermophysics, ISSN 0195-928X, E-ISSN 1572-9567, Vol. 33, no 8-9, p. 1422-1437Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 33, no 8-9, p. 1422-1437
Keywords [en]
Degrees of equivalence, Dew-point temperature, Key comparison
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6419DOI: 10.1007/s10765-011-0950-xScopus ID: 2-s2.0-84879605370Local ID: 23961OAI: oai:DiVA.org:ri-6419DiVA, id: diva2:964257
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2021-01-12Bibliographically approved

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