Patent ID: 7805992

Claim:
A method of detecting a parameter of a gas flowing through a flow channel with a gas sensor, the method comprising: providing a housing defining a chamber; positioning a gas sensor element in said chamber, the gas sensor element configured to detect a parameter of a gas; providing a parallel gas path in said housing, wherein said parallel gas path fluidly couples said chamber to said flow channel, wherein a flow of gas through said parallel gas path is based on a pressure differential cause by a velocity of said gas in said flow channel, wherein said parallel gas path extends away from the flow channel for a distance to provide a sufficient friction to soot particles compared to said gas, such that when a partial quantity of said gas reaches said gas sensor element, said soot particles are substantially avoided by said gas sensor element; and disposing a plurality of fins on an outer surface of said housing along said parallel gas path, wherein the plurality of fins are configured to reduce a temperature of said gas flowing through said parallel gas path.