Patent ID: 8449743
Filing Date: 2013-05-28
Classification: G01N

Abstract:
1. A gas sensor for detecting a predetermined gas component in a measurement gas, said gas sensor comprising: A sensor element comprising solid electrolyte with oxygen ion conductivity; and A protective cover arranged to surround said sensor element, wherein Said protective cover includes an inner protective cover of a bottomed cylindrical shape that has a plurality of inner gas distributing holes formed in two rows on a side surface of said inner protective cover in a longitudinal direction of said sensor element and surrounds one end of said sensor element, wherein each of the plurality of inner gas distributing holes has a substantially round shape, Said plurality of inner gas distributing holes has a plurality of first inner gas distributing holes and a plurality of second inner gas distributing holes, Said plurality of first inner gas distributing holes is formed on the side surface of said inner protective cover in a position on a bottom side of said inner protective cover with respect to a position offset from one front end of said sensor element, Said plurality of second inner gas distributing holes is formed on the side surface of said inner protective cover in another position offset from said front end of said sensor element, and An outer protective cover of a bottomed cylindrical shape that has a plurality of outer gas distributing holes on a side surface of said outer protective cover and surrounds said inner protective cover, wherein each of the plurality of outer gas distributing holes has a substantially round shape, Wherein a total area of said plurality of inner gas distributing holes is determined as S1 and a total opening area of said plurality of second inner gas distributing holes is determined as S2, and S1/S2≦0.44.