| 摘要 |
PURPOSE:To enable detection of humidity in gas by utilizing the electrolysis of water with high accuracy over a wide humidity range by setting a humidity sensitive element which is formed by joining directly an electrode catalyst to one or both surfaces of a high polymer solid electrolyte film permitting migration of hydrogen ion into the gas and impressing a set DC voltage to the joint body thereof. CONSTITUTION:A humidity sensitive element 1 is directly united and joined with a high polymer solid electrolyte film 2 and electrode layers 3, 4 as gas-permeable electrode catalysts on both surfaces thereof to form a joint body 5. An anode terminal 6 and a cathode terminal 7 which impress a DC voltage to the body 5 are likewise united and joined to one body thereto. The film 2 may be an H<+> ion conductor; for example, commercially marketed ''Nafion 117'' is used for the film 2 and rhodium as the layers 3, 4 are joined to both surfaces of the film. Such body 5 is cut to form the element 1. Platinum wires are then press-welded as terminals to both surfaces of the element 1. If a response speed is measured by using such element at the humidity varied to 30%, 60% and 90%, 90% change rate is attained within several minutes and the perfect equil. value is attained within 10min. The hysteresis is within several %. |
