Patent ID: 8470147

Claim:
A gas sensor, comprising: a first ionically conductive substrate including a zirconia based material and a second ionically conductive substrate including a zirconia based material; a first sensing electrode and a first reference electrode coupled to opposite sides of the first ionically conductive substrate and a second sensing electrode and a second reference electrode coupled to opposite sides of the second ionically conductive substrate; a first electrically insulating substrate assembly including magnesium aluminate spinel, the first electrically insulating substrate assembly including a first recess and a second recess spaced apart from the first recess along an axial direction of the sensor; a first heating coil and a separate second heating coil coupled to the first electrically insulating substrate assembly; a second electrically insulating substrate assembly including magnesium aluminate spinel; and a first resistance temperature detector and a separate second resistance temperature detector coupled to the second electrically insulating substrate assembly, wherein: the first sensing electrode, the first heating coil, and the first resistance temperature detector are aligned along a first vertical axis of the sensor, and the second sensing electrode, the second heating coil, and the second resistance temperature detector are aligned along a second vertical axis of the sensor and spaced apart from the first vertical axis along the axial direction of the sensor; and the first ionically conductive substrate is positioned within the first recess, and the second ionically conductive substrate is positioned within the second recess.