Humidity detector

Details Humidity detector Humidity detector

1986-11-05

1988-02-09

Levy, Stewart J.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

73 27R, 733365, 338 35, G01N 2704

Patent

active

047234393

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.

REFERENCES:
patent: 3478574 (1969-11-01), Modell
patent: 3564474 (1971-02-01), Firth et al.
patent: 3959764 (1976-05-01), Allman
patent: 4036592 (1977-07-01), Brown et al.

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