Structure of gas sensor

Citation

Rigelsford, J. (2001), "Structure of gas sensor", Sensor Review, Vol. 21 No. 3. https://doi.org/10.1108/sr.2001.08721cad.022

Structure of gas sensor

Structure of gas sensor

Applicant: Denso Corporation, JapanPatent number: US6222372Publication date: 24 April 2001Title: Structure of gas sensor

This invention relates generally to an improvement on a gas sensor which may be employed in an oxygen measuring device of an air-fuel ratio control system measuring an oxygen content in exhaust gasses of an internal combustion engine of automotive vehicles. A gas sensor measuring a given component content in a gas is provided which has an outer and an inner metallic cover, a sensing unit, and an insulator. The sensing unit consists of a measuring electrode to be exposed to the gas to be measured and a reference electrode to be exposed to a reference gas in a reference gas chamber. The measuring electrode and the reference electrode are disposed adjacent to each other through a solid electrolyte body. The inner metallic cover is installed on an end of a sensor housing. The outer metallic cover is installed on the periphery of the inner metallic cover. The insulator is mounted within the inner metallic cover and has formed therein holes through which sensor signal pick-up leads pass. The insulator has an outer wall different in geometry from an inner wall of the inner metallic cover to define a portion of a reference gas passage there between which leads to the reference gas chamber.