Humidity detector
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United States of America Patent
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Feb 9, 1988
Grant Date -
N/A
app pub date -
Nov 5, 1986
filing date -
Jan 31, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A humidity detector which is disclosed herein includes a humidity sensing element consisting of a heating resistance wire coil and a humidity sensing portion of a metal oxide or metal oxides sintered on the coil with the opposite ends of the coil being exposed, a heating circuit for energizing the coil to increase the temperature of the humidity sensing portion to a level higher than the temperature in a measuring atmosphere, and a resistance variation detecting circuit for detecting the variation in resistance between the opposite ends of the coil depending upon the humidity contained in the measuring atmosphere. The metal oxide may be Al2O3 or a mixture of Al2O3 with at least one selected from the group consisting of SnO2, ZnO, TiO2 and MgO.
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