Patent ID: 6948353
Filing Date: 2005-09-27
Classification: G01N

Abstract:
1. A gas sensor comprising: a hollow cylindrical housing; a gas sensor element retained within said housing which has a sensing portion working to sense a specified gas; and a cover assembly installed on an end of said housing to define a gas chamber in which the sensing portion of said sensing element is disposed and into which the specified gas is admitted, said cover assembly being made up of an inner and an outer hollow cylindrical cover which are different in diameter and have gas inlets through which the specified gas passes, the inner cover being disposed within the outer cover coaxially with each other in a lengthwise direction of the gas sensor with a given clearance therebetween which lies within a range of 0.2 mm to 0.6 mm, the inner cover having a straight wall, extending in parallel to the axis of the inner cover, the gas inlets of the outer cover facing the straight wall of the inner cover and being shifted in a lengthwise direction of the gas sensor from the gas inlets of the inner cover, wherein the gas inlets of each of the inner and outer covers are arrayed along a plurality of lines extending in a longitudinal direction of the inner and outer covers, respectively, and wherein two or more gas inlets are arrayed in each said line.