Validation for a new apparatus measuring water vapour enhancement factors up to 6 MPa

H. Sairanen, Martti Heinonen

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)


High accuracy dew-point measurements require a water vapour enhancement factor to correct the effects of pressure drop in a sampling line. The enhancement factor is also needed when a humidity quantity value is converted to another. In this paper a new apparatus for traceable measurements of the enhancement factor is presented along with the results of validation measurements with air and methane. The apparatus is designed for dew-point temperatures from -50 to +15 °C and the pressure range from atmospheric pressure up to 6 MPa. The performance of the apparatus was investigated by comparing measurement results to the literature data for air and the data calculated from published thermodynamic measurement results for methane. It is shown that the experimental results agree with the reference data within the estimated uncertainties.
Original languageEnglish
Article number035301
Number of pages8
JournalMeasurement Science and Technology
Issue number3
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed


  • dew-point temperature
  • enhancement factor
  • humidity
  • methane
  • air


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