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

H. Sairanen (Corresponding Author), M. Heinonen, R. Högström, J. Salminen, S. Saxholm, H. Kajastie

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (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 languageEnglish
Article number104
JournalInternational Journal of Thermophysics
Volume39
Issue number9
DOIs
Publication statusPublished - 1 Sep 2018
MoE publication typeNot Eligible

Fingerprint

dew
frost
generators
low pressure
humidity measurement
Finland
metrology
atmospheric pressure
expansion
air

Keywords

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

Cite this

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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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Low-Pressure and Low-Temperature Dew/Frost-Point Generator. / Sairanen, H. (Corresponding Author); Heinonen, M.; Högström, R.; Salminen, J.; Saxholm, S.; Kajastie, H.

In: International Journal of Thermophysics, Vol. 39, No. 9, 104, 01.09.2018.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Sairanen, H.

AU - Heinonen, M.

AU - Högström, R.

AU - Salminen, J.

AU - Saxholm, S.

AU - Kajastie, H.

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AB - 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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