Patent ID: 6579436
Filing Date: 2003-06-17
Classification: G01N

Abstract:
A gas sensor, comprising:an oxygen pump cell having a first pump electrode and a second pump electrode disposed on opposite sides of a first solid electrolyte layer; an emf cell having an emf electrode and a reference gas electrode disposed on opposite sides of a second solid electrolyte layer, wherein said emf electrode is disposed in fluid communication to said second pump electrode; a protective insulating layer disposed in contact with said first pump electrode, said protective insulating layer provides a passage for gas to be sensed by said sensor; a first insulating layer disposed in contact with said emf electrode; a via hole disposed through said first solid electrolyte layer whereby said first pump electrode is in fluid communication wit said second pump electrode; a conduit disposed through said first insulating layer whereby said second pump electrode is in fluid communication with said emf electrode; a second insulating layer in contact with said reference gas electrode wherein an air channel is disposed; a heater disposed in thermal communication with said emf cell; and four electrical leads in electrical communication with said sensor, wherein said four electrical leads comprise a first lead in electrical communication with said first pump electrode, a second lead in electrical communication with said reference gas electrode, a third lead in electrical communication with said second pump electrode, said emf electrode, and said heater, and a fourth lead in electrical communication with said heater.