Apparatus for sensing oxides of nitrogen

Details Apparatus for sensing oxides of nitrogen Apparatus for sensing oxides of nitrogen

G - Physics

01

N

G01N 27/407 (2006.01) G01N 27/419 (2006.01) G01N 31/00 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2068131

- 16 - ABSTRACT OF THE DISCLOSURE A structure and a method for sensing oxides of nitrogen in a gas, for example, the exhaust gas of an internal combustion engine. The measurement gas along with oxygen provided by a solid state electrochemical oxygen pumping cell is passed through an oxidation catalyst to oxidize and remove any reducing species in the gas, e.g., carbon monoxide, hydrocarbons, and hydrogen. The oxides of nitrogen are then sensed by a gas sensor which otherwise would respond to both oxides of nitrogen and reducing species in the gas. 4900K

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