Humidity-sensitive sensor

Details Humidity-sensitive sensor Humidity-sensitive sensor

1974-08-12

1976-09-28

Albritton, C. L.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

733365, 200 6104, 219203, 219522, 427126, 428328, 428329, H01C 1300

Patent

active

039835278

ABSTRACT:
A humidity-sensitive sensor, especially useful on the window of an automobile with the sensor on the inside surface of the glass. The sensor has a pair of spaced electrodes and a humidity-sensitive coating composed of a hydroscopic resin extending over the pair of electrodes. The resin can be an acrylate resin or a methacrylate resin, and preferably is a resin which has a volume change of at least 10% in response to a 50% change in humidity. Dispersed in the resin are electrically conductive particles, preferably in an amount of from 20 to 60% by volume of the amount of resin. The sensor, prior to its use in an operating device, is preferably exposed to a high humidity condition and a low humidity condition at least thirty times in order to stabilize it.

REFERENCES:
patent: 2937524 (1960-05-01), Gregor
patent: 3671913 (1972-06-01), Mamiya et al.
patent: 3686606 (1972-08-01), Thoma
patent: 3848218 (1974-11-01), Wakabayashi
patent: 3868492 (1975-02-01), Taylor

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