Patent ID: 6758952
Filing Date: 2004-07-06
Classification: G01N

Abstract:
A gas sensor comprising:a detecting element including a pair of electrodes which are formed on a surface of a solid electrolytic body of an oxygen ion conductive property; a metal shell including a through hole in an axial direction of said metal shell, said metal shell holding said detecting element within said through hole so as to expose a tip portion of said detecting element to a measured gas from a tip side of said through hole; an outer sleeve provided on a rear end side of said metal shell, said outer sleeve internally accommodating said detecting element; and an outer sleeve cover disposed in a rear end opening portion of said outer sleeve, said outer sleeve cover including a vent hole extending from a rear end face of said outer sleeve cover to a tip face of said outer sleeve cover, as a gas flowing path from exterior of said outer sleeve to interior of said outer sleeve, wherein said outer sleeve cover includes a filter unit including a tubular member and a filter, and wherein said tubular member is disposed in said vent hole of said outer sleeve cover, and wherein said filter is disposed in said tubular member and has a permeable property and a water repellent property for covering said vent hole.