Volume 24, Issue 3 (May 1996)

    Accuracy of Wood Resistance Sensors for Measurement of Humidity

    (Received 13 October 1994; accepted 12 December 1995)

    CODEN: JTEOAD

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    Abstract

    This work was undertaken to evaluate the accuracy of wood resistance sensors for measurement of relative humidity and to identify sources of error in this use. Relative humidity can be expressed as a function of the logarithm of the sensor's electrical resistance and of its temperature. We found that single-point calibration of each sensor compensates for most between-sensor variation, although care must be exercised during calibration. With careful calibration readings, error in relative humidity readings made with these sensors can be limited to ± 10% relative humidity under most conditions. The literature indicates that a lower degree of error than this is anticipated when electrical resistance is used to estimate moisture content measurements. Our data suggest that sorption hysteresis and sensor memory are significant contributors to this (± 10%) relative humidity error.


    Author Information:

    Carll, C
    Research forest products technologist and supervisory research physicist, USDA Forest Service, Forest Products Laboratory, Madison, WI

    TenWolde, A
    Research forest products technologist and supervisory research physicist, USDA Forest Service, Forest Products Laboratory, Madison, WI


    Stock #: JTE11296J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11296J

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    Author
    Title Accuracy of Wood Resistance Sensors for Measurement of Humidity
    Symposium , 0000-00-00
    Committee D07