Towards improved humidity measurements at high temperatures and transient conditions

Martti Heinonen; Fausto Arpino; Rien Bosma; Laura Cavallarin; Gino Cortellessa; Marco Dell’Isola; Volker Ebert; Vito C. Fernicola; Eric Georgin; Antonio Giannattasio; Richard Högström; Domen Hudoklin; Anders Kentved; Jan Nielsen; Peter Friis Østergaard; Andrea Peruzzi; Tomi Pietari; Robert-Jan Pouw; Shahin Tabandeh; Wilhelm van Schaik; Steven Wagner

doi:10.1051/metrology/201706002

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Year: 2017

10.1051/metrology/201706002

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Issue		2017 18^th International Congress of Metrology


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

18^th International Congress of Metrology, 06002 (2017)

Towards improved humidity measurements at high temperatures and transient conditions

Martti Heinonen¹, Fausto Arpino², Rien Bosma³, Laura Cavallarin⁴, Gino Cortellessa², Marco Dell’Isola², Volker Ebert⁵, Vito C. Fernicola⁶, Eric Georgin⁷, Antonio Giannattasio⁸, Richard Högström¹, Domen Hudoklin⁹, Anders Kentved¹⁰, Jan Nielsen¹¹, Peter Friis Østergaard¹¹, Andrea Peruzzi³, Tomi Pietari¹², Robert-Jan Pouw¹³, Shahin Tabandeh¹⁴, Wilhelm van Schaik¹⁵ and Steven Wagner¹⁶

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

Abstract

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.

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.