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

Hannu Sairanen; Martti Heinonen; Richard Högström; Juho Salminen; Sari Saxholm; Heikki Kajastie

doi:10.1007/s10765-018-2425-9

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

Hannu Sairanen^*, Martti Heinonen, Richard Högström, Juho Salminen, Sari Saxholm, Heikki Kajastie

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

5 Citations (Scopus)

Abstract

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 language	English
Article number	104
Journal	International Journal of Thermophysics
Volume	39
Issue number	9
DOIs	https://doi.org/10.1007/s10765-018-2425-9
Publication status	Published - 1 Sept 2018
MoE publication type	A1 Journal article-refereed

Funding

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

Keywords

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

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10.1007/s10765-018-2425-9

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abstract = "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.",

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AU - Sairanen, Hannu

AU - Heinonen, Martti

AU - Högström, Richard

AU - Salminen, Juho

AU - Saxholm, Sari

AU - Kajastie, Heikki

PY - 2018/9/1

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N2 - 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.

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

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Keywords

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