Humidity sensor and method for preparing the same

Details Humidity sensor and method for preparing the same Humidity sensor and method for preparing the same

G - Physics

01

N

117/184, 73/71,

G01N 27/12 (2006.01)

Patent

CA 1199537

ABSTRACT OF THE DISCLOSURE The invention relates to a humidity sensor of electric resistance type whose electric resistance changes in accordance with an ambient humidity, charac- terized by a protective film of silicone resin provided on the surface of a humidity-sensitive material, and to a method for preparing the same. The protective film of silicone resin is formed by applying a varnish of siloxanes to the humidity-sensitive material and subjecting the varnish to reaction. The varnish can be of one-pot type or two-pot type, and desirably the reaction of siloxanes is a cross-linking reaction. The formed protective film is not influenced by swelling or shrinking of the humidity-sensitive material, and is prevented from flowing off due to a temperature rise, or from deposition of dusts, etc.

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