Patent ID: 9091646
Filing Date: 2015-07-28
Classification: G01N,Y02A

Abstract:
1. A gas sensor comprising a sensor device including a gas inlet port, an inner pump electrode in communication with the gas inlet port, and an outer pump electrode disposed respectively on an inner side and an outer side of a base member made of a solid electrolyte layer having oxygen-ion conductivity, the sensor device detecting concentration of a particular gas in an object gas to be measured with operations of introducing the object gas through a gas inlet port into a gas chamber to which the inner pump electrode is exposed and pumping out oxygen in the gas chamber to the outside from the inner pump electrode through the outer pump electrode, and a heater disposed adjacent to the sensor device to be capable of heating the sensor device, wherein the gas inlet port includes an opening on an outermost external surface of the base member, wherein the gas sensor further comprises (i) a characteristic stabilizing layer that is spaced from the opening of the gas inlet port on a plane perpendicular to the outermost external surface of the base member, so as to cover the outer pump electrode, said characteristic stabilizing layer being made of a porous body with a thickness of 10 to 200 μm and a thickness variation of 20% or less, and (ii) a thermal insulation layer formed only on the outermost external surface plane of the base member so as to cover the opening of the gas inlet port, and wherein the thermal insulation layer covers the entirety of the outermost external surface of the base member.