Pressure influence in capacitive humidity measurement

C.C.M. Luijten, M.E.H. Dongen, van, L.E. Stormbom

    Research output: Contribution to journalArticleAcademicpeer-review

    15 Citations (Scopus)

    Abstract

    We investigated the behaviour of a capacitive humidity transducer (Vaisala HMP 234) upon pressure exposure of nitrogen and helium up to 100 bar, using a humidity generator based on saturation of the gases at temperatures below ambient. The increased saturated vapour pressure of water in the presence of nitrogen and helium (enhancement effect) was quantitatively taken into account. The sensor output was found to decrease with nitrogen pressure at fixed relative humidity (RH). Still, by taking the total pressure as an independent calibration parameter, the device can be used in nitrogen gas within error bounds of ±1% RH. For helium no deviation of the sensor output with pressure was observed, showing that the deviation strongly depends on gas properties. For similar pressure calibrations in other gases, accurate data of enhancement factors have to be available.
    Original languageEnglish
    Pages (from-to)279-282
    Number of pages4
    JournalSensors and Actuators, B: Chemical
    Volume49
    Issue number3
    DOIs
    Publication statusPublished - 1998

    Fingerprint Dive into the research topics of 'Pressure influence in capacitive humidity measurement'. Together they form a unique fingerprint.

    Cite this