HYDROGEN GAS DETECTION SENSOR

PROBLEM TO BE SOLVED: To provide a catalytic combustion type hydrogen gas detection sensor excellent in a poisoning resistance of platinum catalyst against carbon monoxide. SOLUTION: This hydrogen gas detection sensor for detecting hydrogen gas by converting thermoelectrically heat generated by a catalytic reaction between the hydrogen gas and a catalyst to detect a generated voltage is provided with a prescribed thickness of thermoelectric variable film 2, a catalyst film 3 layered via an insulating film 13 in a substantial half of one side on a thermoelectric variable film 2 surface, and a heating means 9 for heating the catalyst film 3 up to a prescribed temperature. The catalyst film 3 carries a platinum (Pt) fine particles on a particle of a metal oxide, and a temperature change generated with the heat by the catalytic reaction of oxidation due to contact between the hydrogen gas and the catalyst film 3 is detected to detect the hydrogen gas. COPYRIGHT: (C)2006,JPO&NCIPI