Patent ID: 8042380
Filing Date: 2011-10-25
Classification: G01N

Abstract:
1. A gas sensor comprising: a detection element, extending in the axial direction, that detects a particular gas component in a gas under measurement; a casing surrounding a periphery of the detection element and having a front end from which a front end of the detection element protrudes so that the front end of the detection element is exposed to the gas under measurement; a seal member disposed on a rear side with respect to the detection element and also inside the rear end of the casing, the seal member having a ventilation hole penetrating therethrough in the axial direction; a crimped part of the casing holding the seal member; a hollow-cylindrical member being in contact with an inner peripheral surface of the ventilation hole and being located opposed to and being held in place by the crimped part; and at least one of a metallic filter or a ceramic filter that joins to the hollow-cylindrical member at a base end of the hollow-cylindrical member and on a rear end side with respect to the crimped part, and that at least covers the ventilation hole, wherein said metallic filter or ceramic filter is coated with a water repellent material.