Detecting element for composition gases

Abstract

Abstract PURPOSE:To detect >=2 kinds of gases simultaneously by providing 3 pieces or more of electrodes spacially to a base body consisting of a gas sensitive material, and providing gas sensors which detect different gases on these electrodes. CONSTITUTION:Electrodes 12, 121, 122 of iridium-palladium metallic wires are disposed on a base body 11 formed of a valency control type semiconductor gas sensitive material consisting essentially of SnO2, ZnO and are stuck thereto by means of adhesives 13. The carbon monoxide sensitive paste contg. for example, either or both of aluminum and antimony, either or both of oxides of palladium and platinum, and chlorine and consisting of the balance tin oxide is coated on these electrodes, whereby a gaseous carbon monoxide sensor 141 and a gaseous methane sensor 142 are provided. If a voltage is applied to both terminals of the gas detecting element electrodes 122 constituted in this way and the sensor 142 is heated to the temp. suitable for detection of gaseous CH4, the heat is transferred through the body 11, and the sensor 141 attains the temp. suitable for detection of gaseous CO, whereby two kinds of the gases are detected simultaneously with the same element.

Inventors

• 👤 Nobuyuki Yamaji
• 👤 信幸 山地

Bibliographic Details