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AssigneeRobert Bosch GmbH
InventorsKarl-Hermann Friese, Helmut Weyl, Siegfried Nees, Hans-Martin Wiedenmann
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An electro-chemical measuring sensor (10) for determining the oxygen content of gases, in particular for determining the oxygen content in exhaust gases of internal combustion engines, with a potential-free disposed sensor element (14). The sensor element (14) has an oxygen-ion-conducting solid electrolyte body (23), preferably in the shape of a pipe or tube closed at one end, which has an exterior electrode (25) disposed on the exterior surface with a strip conductor (27) on the side toward the contact and also extending on the exterior surface, and which is inserted by means of a sealing ring (20) in a metal housing (11). The sensor element (14) has an electrically insulating layer (21) at least in the area of the sealing ring (20), which covers at least the strip conductor (27) in the direction toward the housing (11). The insulating layer (21) is formed from a mixture of a crystalline, non-metallic material and a glass-forming material. In the course of production the insulating layer (21) is subjected to a thermal treatment above the melting temperature of the glass-forming material, in the course of which the insulating layer (21) forms a glaze filled with the crystalline, non-metallic material.
An electro-chemical measuring sensor for determining the oxygen content of gases, including a potential-free arranged sensor element having an oxygen-ions-conducting solid electrolyte body and electrodes with electrically conducting connectors, wherein the sensor element is inserted with a sealing ring into a metal housing and at least one electrically conducting connector facing the housing is electrically insulated in respect to the housing by an electrically insulating layer in the area of the sealing ring, wherein the insulating layer is formed of a mixture of a crystalline, non-metallic material and a glass-forming material such that a glaze filled with crystalline, non-metallic material is formed by heating, and wherein the glass-forming material is an earth alkali silicate glass.
An electro-chemical measuring sensor for determining the oxygen content of gases including a potential-free arranged sensor element having an oxygen-ions-conducting solid electrolyte body and electrodes with electrically conducting connectors, wherein the sensor element is inserted with a sealing ring into a metal housing and at least one electrically conducting connector facing the housing is electrically insulated with respect to the housing by an electrically insulating layer in the area of the sealing ring, wherein the insulating layer is formed of a mixture of a crystalline, non-metallic material and a glass-forming material such that a glaze filled with the crystalline, non-metallic material is formed by heating, and wherein an intermediate layer is disposed between the electrically conducting connector and the insulating layer at least in the area of the electrically insulating section.
An electro-chemical measuring sensor for determining the oxygen content of gases including a potential-free arranged sensor element having an oxygen-ions-conducting solid electrolyte body and electrodes with electrically conducting connectors, wherein the sensor element is inserted with a sealing ring into a metal housing, wherein at least one electrically conducting connector facing the housing is electrically insulated with respect to the housing by an electrically insulating layer in the area of the sealing ring, wherein the insulating layer is formed of a mixture of a crystalline, non-metallic material and a glass-forming material such that a glaze with the crystalline, non-metallic material is formed by heating, and wherein a ceramic cover layer is placed over the insulating layer, at least in the area of the sealing ring, to absorb mechanical pressure forces of the sealing ring.
Dependencies are inferred from the claim text.