Patent ID: 6579435
Filing Date: 2003-06-17
Classification: G01N

Abstract:
A gas sensor, comprising:an oxygen pump cell having an exterior pump electrode and an interior pump electrode disposed on opposite sides of a first solid electrolyte layer; an emf cell having a first and second emf electrodes and first and second reference gas electrodes disposed on opposite sides of a second solid electrolyte layer; a via hole disposed through said first solid electrolyte layer; an air channel disposed through a first insulating layer wherein the air channel layer is in fluid communication with said first and second emf electrodes; an air vent disposed in at least a second insulating layer in fluid communication with said first and second reference gas electrodes; a heater disposed in thermal communication with said sensor; and at least five electrical leads in electrical communication with said sensor; wherein said interior pump electrode and said first and second emf electrodes are in fluid communication through said first insulating layer.