engleski

Intercomparison of the Dew-Point Temperature Realizations at LPM and MIKES in the Range from −70 ◦C to +20 ◦C

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.

bilateral degrees of equivalence; Dew-point temperature; supplementary comparison

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