Abstract
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 language | English |
|---|---|
| Article number | 035301 |
| Number of pages | 8 |
| Journal | Measurement Science and Technology |
| Volume | 25 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2014 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- dew-point temperature
- enhancement factor
- humidity
- methane
- air