Patent ID: 6238536
Filing Date: 2001-05-29
Classification: F01N,F02D,G01N

Abstract:
Apparatus for analyzing exhaust gases from a combustion process comprising at least one sensor unit mounted for direct contact with said exhaust gases, said at least one sensor unit comprising a plurality of sensor elements mounted on a common substrate for detecting specific gases contained in said exhaust gases and generating signals based thereon, wherein at least one of said sensor elements is a NO.sub.x sensor, said NO.sub.x sensor including an oxygen-ion transporter, said NO.sub.x sensor having an anode and a cathode, said cathode comprising a metal which is selective for the dissociation of nitrogen oxide as compared to oxygen, whereby said NO.sub.x sensor generates said signal based substantially only on the NO.sub.x content of said exhaust gases and substantially independent of the oxygen content of said exhaust gases, said substrate comprising an oxygen-ion-conductive ceramic material and said plurality of sensor elements comprising conductive patterns applied to said common substrate, and a common analyzer unit connected to said at least one sensor unit for analyzing said signals generated by said plurality of sensor elements.