Back to results
US 7,479,255 B2Granted
Gas sensor
AssigneeRiken Keiki Co., Ltd.
InventorsSeiichi Otani, Yukio Nakamura, Mamoru Furusato
Life of this patent
Estimating the term…
Abstract
A hydrogen sensor 25 has a fitting base plate 29 in which a gas-sensing chamber 34 is formed, a specimen gas intake 35 formed on said fitting base plate 29, opening toward an exit passage 24 and introducing hydrogen gas into the gas-sensing chamber 34, a gas-sensing element 39 held in the gas-sensing chamber 34 and adapted to sense hydrogen gas, and a water-repelling filter 44 covering the specimen gas intake 35.
Claims15
A gas sensor comprising:
- a gas-sensing element comprising a catalyst;
- a temperature-compensating element;
- a case holding said elements;
- a chip-type resistor heater disposed between a specimen gas intake of the case and the gas-sensing and temperature-compensating elements;
- and
- a water-repelling filter disposed at the specimen gas intake of the case;
- wherein the concentration of a specimen gas is determined from the difference in electrical resistance between the gas-sensing element and the temperature-compensating element.
4 more elements
A gas sensor comprising:
- a gas-sensing element comprising a catalyst;
- a temperature-compensating element;
- a case holding said elements;
- a heater disposed between a specimen gas intake of the case and the gas-sensing and temperature-compensating elements at a point where the specimen gas intake is divided and a lead-in segment distributes the specimen gas to the sensing and temperature-compensating elements;
- and
- a water-repelling filter disposed at the specimen gas intake of the case;
- wherein the concentration of a specimen gas is determined from the difference in electrical resistance between the gas-sensing element and the temperature-compensating element.
4 more elements
A gas sensor comprising:
- a gas-sensing element comprising a catalyst;
- a temperature-compensating element;
- a case holding said elements;
- a pair of heaters each having a heat-release surface extending along the direction in which the specimen gas flows such that the sensing and temperature-compensating elements are disposed between the paired heaters;
- and
- a water-repelling filter disposed at the specimen gas intake of the case;
- wherein the concentration of a specimen gas is determined from the difference in electrical resistance between the gas-sensing element and the temperature-compensating element.
4 more elements
A gas sensor comprising:
- a gas-sensing element comprising a catalyst;
- a temperature-compensating element;
- a case holding said elements;
- a pair of heaters each having a heat-release surface extending along the direction in which the specimen gas flows disposed between the sensing and temperature-compensating elements so that the heat-release surfaces thereof face the sensing and temperature-compensating elements;
- and
- a water-repelling filter disposed at the specimen gas intake of the case;
- wherein the concentration of a specimen gas is determined from the difference in electrical resistance between the gas-sensing element and the temperature-compensating element.
4 more elements
A gas sensor comprising:
- a gas-sensing element comprising a catalyst;
- a temperature-compensating element;
- a case holding said elements;
- a pair of heaters disposed between the sensing and temperature-compensating elements and fitted to a member that fastens said sensing and temperature-compensating elements;
- and
- a water-repelling filter disposed at the specimen gas intake of the case;
- wherein the concentration of a specimen gas is determined from the difference in electrical resistance between the gas-sensing element and the temperature-compensating element.
4 more elements
Dependencies are inferred from the claim text.