Low-Pressure and Low-Temperature Dew/Frost-Point Generator

Hannu Sairanen (Corresponding Author), Martti Heinonen, Richard Högström, Juho Salminen, Sari Saxholm, Heikki Kajastie

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)


Lately demands for traceability and improved accuracy in climatic humidity measurements at extreme conditions have been increasing. To address these needs a new dew/frost-point generator was developed and constructed at the Centre for Metrology MIKES of the VTT Technical Research Centre of Finland Ltd. for the range from − 90 °C to + 15 °C. The generator operates in a single-pressure principle at the absolute air pressure range from 10 hPa to 3500 hPa. With an expansion valve it can be applied also in two-pressure mode. Within this paper the new low-pressure and low-temperature dew/frost-point generator and its characterization are presented in detail. The outcomes of the characterization show that when operating in a single-pressure mode within barometric pressure range a standard uncertainty of 0.043 °C is achieved in complete temperature range. When considering the complete pressure range the standard uncertainty is larger, but it does not exceed 0.06 °C.

Original languageEnglish
Article number104
JournalInternational Journal of Thermophysics
Issue number9
Publication statusPublished - 1 Sep 2018
MoE publication typeNot Eligible


  • Dew-point generator
  • Frost-point generator
  • Humidity
  • Low pressure
  • Uncertainty

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