Issue |
2017
18th International Congress of Metrology
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Article Number | 06002 | |
Number of page(s) | 8 | |
Section | Applied thermal measurements / Mesures thermiques appliquées | |
DOI | https://doi.org/10.1051/metrology/201706002 | |
Published online | 18 September 2017 |
Towards improved humidity measurements at high temperatures and transient conditions
1 VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, FI-02044 VTT, Finland
2 Università degli Studi di Cassino e del Lazio Meridionale, 03043 Cassino, Italy
3 VSL, Dutch Metrology Institute, 2600 AR Delft, the Netherlands
4 Istituto di Scienze delle Produzioni Alimentari CNR, 10095 Grugliasco, Italy
5 Physikalisch-Technische Bundesanstalt, 38112 Braunschweig, Germany
6 Istituto Nazionale di Ricerca Metrologica, 10135 Torino, Italy
7 LNE-CETIAT, 69603 Villeurbanne, France
8 GBV Impianti Srl, 12074 Cortemilia, Italy
9 University of Ljubljana, Faculty of Electrical Engineering, 1000 Ljubljana, Slovenia
10 FORCE Technology, DELTA, DK-2970 Hørsholm, Denmark
11 Danish Technological Institute, DK-8000 Aarhus C., Denmark
12 Vaisala Oyj, 01670 Vantaa, Finland
13 Michell Instruments Benelux B.V., 4906 CR Oosterhout, the Netherlands
14 Politecnico di Torino, 10129 Torino, Italy
15 van Schaik Innovation Handling B.V., 5617 BA Eindhoven, the Netherlands
16 Technische Universität Darmstadt, HTPD, Jovanka-Bontschits-Str. 2, 64287 Darmstadt, Germany
Humidity is a key parameter in controlling drying processes and ambient conditions in many industrial manufacturing, storage and test applications. Air humidity is routinely measured at temperatures above 100 °C and at conditions that are often challenging due to temporal and local variations. Calibrations of humidity sensors do not provide appropriate representativeness of measurement conditions because they are limited to temperatures below 100 °C and static conditions. A European metrology research project HIT (“Metrology for Humidity at High Temperatures and Transient conditions”) is developing improved humidity measurement and calibration techniques to temperatures up to 180 °C and non-static conditions. This paper summaries developments of the project: calibration and test facilities for industrial hygrometers, studies on humidity control in specific microbial transient processes and a new measurement approach for water activity measurements.
© The Authors, published by EDP Sciences, 2017
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.