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

    4 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 Sept 2018
    MoE publication typeA1 Journal article-refereed


    This work was supported by the European Metrology Research Programme (EMRP) jointly funded by the EMRP participating countries within EURAMET and the European Union.


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


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