A MOISTURE-SENSING HYGROMETER ELEMENT AND METHOD FOR MANUFACTURING THE ELEMENT

摘要

A moisture-sensing hygrometric element comprises an electrolytic moisture-sensing mechanism integrally formed on the surface of a porous substrate (1), the porous substrate being resistant to oxidation and reduction and resistant to acids, wherein the moisture-sensing mechanism comprises a pair of platinum group metal electrodes (2) constituting an anode and a cathode and a fluororesin-type cation exchange resin membrane layer (4) thereover. The porous substrate (1) may be a porous ceramic or a porous fluororesin such as expanded polytetrafluoroethylene. The hygrometric element may have a covering layer (5) thereover of porous, expanded polytetrafluoroethylene. The fluororesin-type cation exchange resin membrane layer is preferably formed by applying a coating of a solution of the fluororesin-type cation exchange resin to the electrodes on the substrate, and heating and drying the coating.