Patent ID: 7546758
Filing Date: 2009-06-16
Classification: G01N

Abstract:
1. A gas sensor comprising: a sensor element sensitive to a gas to produce a signal as a function of concentration of the gas, said sensor element having a length with a top end and a base end opposite the top end; a housing in which said sensor element is retained, said housing having a top end and a base end opposite the top end; an air cover assembly having a top end and a base end opposite the top end, said air cover assembly being made up of an inner cover and an outer cover, the inner cover being secured to the base end of said housing, the outer cover surrounding the inner cover and being joined to the inner cover through at least one crimped portion; an air inlet formed in a portion of said air cover assembly which is closer to the base end of said air cover assembly than the crimped portion, the air inlet being designed to admit air into said air cover assembly; and an air chamber defined by the crimped portion between the inner and outer covers of said air cover assembly from the crimped portion circumferentially of said air cover assembly, said air chamber being exposed outside said air cover assembly at a side opposite said air inlet across the crimped portion to define a water drain path establishing fluid communication between said air inlet and outside said air cover assembly.