Abstract
Three European National Metrology Institutes (NMIs), VSL, LNE-CETIAT and INRiM, extended their relative humidity calibration capabilities to temperatures up to 170 °C, dew-point temperatures up to 150 °C and pressures up to 600 kPa. In order to test the equivalence of the respective calibration set-ups, 4 commercial high-temperature relative humidity sensors were exchanged among the three NMIs and calibrated at different combinations of relative humidity (19 %rh to 70 %rh), air temperature (100 °C to 170 °C) and pressure (100 kPa to 500 kPa), realizing dew-point temperatures of either 81.5 °C or 127 °C. The initial and final measurements at VSL showed that the stability of the selected sensors was sufficient for comparing the different calibration set-ups. The results of the comparison showed that VSL and LNE-CETIAT facilities agreed within their claimed uncertainties (≤0.3 %rh), while discrepancies of up to 4 %rh were observed between VSL and INRiM facilities.
| Original language | English |
|---|---|
| Article number | 110435 |
| Journal | Measurement |
| Volume | 189 |
| DOIs | |
| Publication status | Published - 15 Feb 2022 |
| MoE publication type | A1 Journal article-refereed |
Funding
This project (HIT, Metrology for humidity at high temperatures and transient conditions, project n. 14IND11) received funding from the EU EMPIR programme co-financed by the Participating States and the European Union.
Keywords
- Dew-point temperature above 100 °C
- Relative humidity up to 170 °C
- Sensors for relative humidity up to 170 °C