MONITORING OF SURFACE MOISTURE BY MINIATURE MOISTURE SENSORS . DURABILITY OF BUILDING MATERIALS AND COMPONENTS. PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE HELD IN BRIGHTON, NOVEMBER 7-9, 1990

A new electrolytic cell with resistance grids of Au has been developed and tried out according to the NILU WETCORR method in a climatic chamber. A commercial dew sensor, Murata HOS103, was also included in the evaluation programme. Several specimens of each sensor have been tested under varying temperature and relative humidity while mounted on a substrate of coil coated sheet metal. Although quite different in character, both sensors have shown acceptable properties in terms of individual variability, sensitivity, reproducibility and long-term stability. Regression analysis has provided an empirical relationship between on one side the current through the Au/Au-sensor, and on the other side the ambient relative humidity and the surface temperature. The equation works well for temperatures from 0 to 30 deg C and relative humidity (RH) values in the range of 50 to 100%. The dew sensor, HOS103, was found to react drastically to moisture loads exceeding 90 to 95% RH. Surface moisture measurements using the two types of sensors evaluated, can give valuable information about the microclimate on and near surfaces of buildings. Such knowledge is important when describing the interaction between the microclimate and the degradation of the materials. (Author/TRRL)

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  • Corporate Authors:

    E and F Spon Limited

    2-6 Boundary Road
    London,   England 
  • Authors:
    • Norberg, P
  • Publication Date: 1991

Language

  • English

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Filing Info

  • Accession Number: 00617520
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 0-419-15480-9
  • Files: ITRD, TRIS
  • Created Date: Nov 30 1992 12:00AM