A new comparison method for dew-point generators

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Abstract

A new method for comparing dew-point generators was developed at the Centre for Metrology and Accreditation. In this method, the generators participating in a comparison are compared with a transportable saturator unit using a dew-point comparator. The method was tested by constructing a test apparatus and by comparing it with the MIKES primary dew-point generator several times in the dew-point temperature range from -40 to +75 °C. The expanded uncertainty (k = 2) of the apparatus was estimated to be between 0.05 and 0.07 °C and the difference between the comparator system and the generator is well within these limits. In particular, all of the results obtained in the range below 0 °C are within ± 0.03 °C. It is concluded that a new type of a transfer standard with characteristics most suitable for dew-point comparisons can be developed on the basis of the principles presented in this paper.

Original languageEnglish
Pages (from-to)1261-1265
Number of pages5
JournalMeasurement Science and Technology
Volume10
Issue number12
DOIs
Publication statusPublished - 1 Jan 1999
MoE publication typeA1 Journal article-refereed

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Keywords

  • Dew-point comparator
  • Dew-point temperature
  • Relative humidity hygrometer
  • Saturator
  • Transfer standard

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