Oxygen sensor

Chemistry: electrical and wave energy – Apparatus – Electrolytic

Patent

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Details

204412, 204425, 204426, G01N 2758

Patent

active

046505601

ABSTRACT:
An oxygen sensor, suited for measuring the concentration of an oxygen gas contained in an exhaust gas of an automobile, comprises a cell and a heater which is mounted for heating the cell. The heater, including an electrically insulating substrate and a heating element embedded in the substrate, has a recess on one surface thereof and a pair of side wall portions formed by forming the recess. The cell comprises a solid-electrolyte body, a detection electrode, a reference electrode and a chamber enclosing the reference electrode except for its opening. The cell is disposed in the recess of the heater and joined to the heater with an intermediate layer being disposed between the cell and the heater and sintered. The intermediate layer has a number of fine cracks and an intermediate thermal expansion coefficient between these of the solid-electrolyte and the substrate.

REFERENCES:
patent: 4601809 (1986-07-01), Kitahara

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