Abstract
The first European humidity key comparison EURAMET-T.K6 was completed in 2008, and it covered the dew-point temperature range from −50 °C to + 20 °C. Both LPM and MIKES participated in the comparison, but a new low dew-point generator was introduced at LPM as a result of progress in the EUROMET P912 project. To extend the range of available comparison evidence down to −70 °C and to study the validity of improved uncertainties of LPM, a bilateral comparison was carried out between LPM and MIKES in 2009–2010. The applied comparison procedure was similar to that applied in EURAMET-T.K6. However, only one transfer standard was used instead of two units and the measurement point −70 °C was added in the measurement scheme. The results show that the bilateral equivalence between LPM and MIKES is between (0.00 ± 0.06) °C and (0.02 ± 0.08) °C in the range from −50 °C to + 20 °C and (0.01 ± 0.10) °C at −70 °C. Using MIKES results as the link to the EURAMET.T-K6, it is shown that the difference between the results obtained with the new LPM dew-point temperature standard and the EURAMET Comparison Reference Values is between (−0.02 ± 0.08) °C at 20 °C and (+ 0.02 ± 0.07) ° C at −50 °C.
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IEC 60751 (1995-07) (ISO, Geneva, 1995)
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Heinonen, M., Zvizdic, D. & Sestan, D. Intercomparison of the Dew-Point Temperature Realizations at LPM and MIKES in the Range from −70 °C to + 20 ° C. Int J Thermophys 33, 1451–1457 (2012). https://doi.org/10.1007/s10765-011-1105-9
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DOI: https://doi.org/10.1007/s10765-011-1105-9