Oxygen sensor for preventing silicon poisoning

Details Oxygen sensor for preventing silicon poisoning Oxygen sensor for preventing silicon poisoning

1995-03-21

1998-12-15

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204424, 204425, 204426, 204427, 2057845, 205785, 422 98, 4271261, 427402, 4274191, 4274432, G01N 2712, G01N 2741, G01N 27409

Patent

active

058491651

ABSTRACT:
Oxygen sensor element (ZrO.sub.2 solid electrolyte etc) for detecting oxygen concentration in an exhaust gas has a protective layer which is made of a heat-resistant metal oxide and which carries a component of a IIa subgroup element (Ca, Mg etc) on the side exposed to the exhaust gas of the sensor element, at least a part of the protective layer being present as a nonstoichiometric compound (Ti oxide etc) with respect to the heat-resistant metal oxide. Si-poisoning is prevented. Heater for heating the sensor element is provided for preventing Si-poisoning at low temperatures.

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