Abstract: A gas sensor including a sealing arrangement for sensing exhaust gases of internal combustion engines includes a housing for the sealing arrangement having a longitudinal bore; a planar sensor element secured in the longitudinal bore of the housing; a spring element; upper and lower molded parts that are pressed together by means of the spring element; and a sealing material comprised of a ceramic powder and disposed between the upper and lower molded parts and surrounding the sensor element in a gas-tight manner, wherein the lower molded part consists of a disk-shaped base part and a ring that rests on the disk-shaped base part so that an inside space is defined within the ring for holding the ceramic powder, wherein the upper molded part has a ring-shaped, stepped recess which is pressed into the inside space of the lower molded part, and wherein the ceramic powder in the inside space is held in a compressed state due to compressing forces exerted by the spring element.

Abstract: A measuring device, in particular, an electrochemical sensor, has a sensor element arranged at a measuring point. The sensor element is arranged in a housing and is connected via electrical connecting lines to an evaluation circuit away from the measuring point. The electrical connecting lines are run, at least in the vicinity of the measuring point, in a protective device. The protective device forms a sealing seat with the housing. The housing in the area of the sealing seat, at least in some areas, has a coating.

Abstract: A engine exhaust gas measuring sensor having a sealing device and having a sleeve suitable for connection to a housing including a sealing element which is arranged at an end of sleeve facing away from the housing so that a reference air chamber is formed within the sleeve. The sealing element also has at least one opening extending longitudinally and at least one oblong contact which penetrates the opening and serves the purpose of establishing an electrical bond with a sensor element of the lambda probe. A glass seal is placed within the opening for the purpose of sealing and insulation. The glass seal encloses a longitudinal section of the contact located within the opening in the form of a jacket. The sealing element and the sleeve are made of metal. A method for making such an engine exhaust gas sensor includes the steps of introducing solder glass in a sealing element opening, heating the solder glass so that it becomes fluid and cooling the glass so that is solidifies or sets.

Abstract: A Lambda probe type gas sensor for use in determining the oxygen content of exhaust gases produced by an internal combustion engine includes a sensor element of the electrochemical, solid electrolyte, metallic oxide semiconductor or Lambda air-fuel ratio variety, which sensor element is arranged in a metallic housing and is contacted by connecting cables that are brought out of the metallic housing. These connecting cables are each surrounded by cable insulation that is made of PTFE (Polytetra-fluoroethylene). The surface of the cable insulation has, at least in certain areas, a gas-permeable section that allows a reference atmosphere to arrive inside the cable insulation and, from there, in the metallic housing. The gas-permeable section, on the other hand, prevents ingress of liquids such as fuel, condensed water, etc., This is achieved, for example, by an additionally applied, PTFE film that is placed over the gas-permeable section.

Abstract: A cable bushing in a housing for a device which may be a gas sensor and which may be connected to at least one connecting cable having an electrical conductor and cable insulation includes a molded body provided inside an opening of the housing and through which the at least one connecting cable is guided. The molded body has defined therein at least one bushing tube and has an outer cylindrical wall in which is defined a ring groove starting at one frontal side and extending axially inside the molded body, the at least one bushing tube and the ring groove being separated by an inner wall. The inner wall and the outer cylindrical wall of the molded body have respective thicknesses, and the thickness of the outer cylindrical wall is less than the smallest wall thickness of the inner wall. A support ring is positioned in the ring groove and serves as an outer support for wedging in the molded body into the opening of the housing.

Abstract: A sensor device, particularly for determining the oxygen content in exhaust gases of internal combustion engines, having a sensor element that is surrounded gas-tight by a seal and fixed in a housing. The seal (19) is inserted as a pre-sintered, deformable sealing body (19') into the housing (12), between a ceramic molded body on the side of the measured gas and a ceramic molded body on the connection side (18, 20); the pre-sintered sealing body (19') can be deformed under pressure. The ceramic molded parts (18, 20) and the sealing body (19') have respective axially-extending throughgoing holes (32, 42, 52). The sealing body (19') has formed-on structures that narrow the cross section of the throughgoing hole (42) and are deformed by the sensor element (22) when the sensor element (22) is inserted such that the sensor element (22) is stopped, arrested or fixed in the installed position in the throughgoing hole (42) by the formed-on structures.

Abstract: A seal for a sensor element for a gas sensor for determining the oxygen content in a gas to be measured including exhaust gases of internal combustion engines, the seal including a metallic housing having defined therein a longitudinal bore; a sensor element inserted into the longitudinal bore; and a sealing arrangement provided in the longitudinal bore, surrounding at least a portion of the sensor element, and comprised of at least one seal element comprised of steatite and an additional seal element comprised of boron nitride arranged in contact with one another and in a stack having a side near the gas to be measured so that, when there is one seal element comprised of steatite, the one seal element comprised of steatite is positioned on the side of the stack near the gas to be measured, and so that, when there are two seal elements comprised of steatite, the additional seal element is positioned between the two seal elements comprised of steatite, wherein the at least one seal element comprised of steatit

Abstract: A seal for a sensor element of a gas sensor for determining the oxygen content in gases including exhaust gases of an internal combustion engine, which seal seals the sensor element in a longitudinal bore of a housing, the seal including a sealing stack which is positioned within the longitudinal bore of the housing and around the sensor element in use and which is comprised of two sealing bodies and an additional seal positioned between the two sealing bodies. The two sealing bodies are comprised of a pre-sintered ceramic material. The additional seal is comprised of a pre-pressed powder material and has a porosity which is lower than that of the two sealing bodies. The two sealing bodies and the additional seal are compressed together within the longitudinal bore in use, whereby at least the additional seal is deformed so that the sensor element is sealed in a gap-free manner within the longitudinal bore.

Abstract: An electrochemical measuring element for determining oxygen content in exhaust gases of internal combustion engines includes a metallic housing; a sensor element which is a tube that is closed at one end, which is inserted into the metallic housing, and which forms a structural unit with the metallic housing; a seal composed of a glass sealing and a metallic sleeve, the glass sealing connecting the sensor element and the metallic sleeve in a gas-tight manner; and a ceramic sealing ring which is disposed between the sensor element and the metallic sleeve, wherein the glass sealing is inserted between the sensor element and the ceramic sealing ring, as well as between the ceramic sealing ring and the metallic sleeve, wherein the sensor element and the seal form a preassembled structural unit which can be inserted into the metallic housing, and wherein the metallic sleeve is welded to the metallic housing in a gas-tight manner.

Abstract: An arrangement of a sensor element of an electrochemical measuring sensor in a metallic housing is proposed, wherein the sensor element (13) in the form of a tube closed at one end rests with a metallic sealing ring (18) on a seal seat (16) implemented on the housing. The seal seat (16) is designed as a raised circular ring surface having a radius (r), with the sealing ring (18) orienting itself tangentially with respect to the radius (r).

Abstract: An electrochemical measuring sensor for determining the oxygen content of gases, such as exhaust gases of internal combustion engines, includes a housing having an annular sealing seat defined on an inner surface thereof; a sensor element which is comprised of a solid electrolyte body which is oxygen-ion conducting, which has a form of a tube having a closed end and which has an annular shoulder provided thereon; and a seal ring positioned between the annular sealing seat of the housing and the annular shoulder of the solid electrolyte body, and including a plurality of resilient elements distributed thereon.

Abstract: 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.

Abstract: The electrochemical sensor for determination of an oxygen content of exhaust gases, includes a probe element including a tube made from a raw material mixture consisting essentially of an ionically conductive solid electrolyte; an outer electrode located on the outer surface of the tube; a substantially pore-free conductor strip layer located on the outer surface, connected to the outer electrode, and extending toward the open end, the conductor strip layer having a portion in close proximity to the tube open end; and a substantially pore-free cover layer hermetically covering at least the portion of the pore-free conductor strip layer in close proximity to the open end of the tube, the cover layer being made from a cover layer material including the ionically conductive solid electrolyte. The cover layer material advantageously a sintering activity which is at least equal to that of the raw material mixture from which the tube is made.

Abstract: An electrochemical measuring probe for determining the oxygen content of gases, in particular of exhaust gases of internal combustion engines, whose measuring probe body consists essentially of a solid electrolyte, for example stabilised ZrO.sub.2 and whose electrode exposed to the gas to be measured is a cermet electrode which is coated with a finely porous ion-conducting covering layer composed of an ion-conducting supporting matrix material having no sintering activity of the type standard for cermet electrodes the covering layer is covered by a porous protective layer. The ion-conducting porous covering layer appreciably increases the activity of the cermet electrode.

Abstract: An electrochemical measuring sensor is proposed for determining the oxygen content in exhaust gases which has a base body made of an ion-conducting solid electrolyte in the form of a tube closed at one end, an inner electrode, an outer electrode disposed on the external surface of the probe block and having a conductor track on the connection side which has a covering layer, a ceramic protective layer and a metallic sealing ring for sealing the reference space from the exhaust gas space and for making an electrical contact to the housing in which the measuring sensor is to be inserted. The electrochemical covering layer covering the conductor track is brought down on the reference side of the probe block to below the metallic sealing ring and the track is formed with uncovered lateral extensions making electrical contact with the ring. This makes it possible to significantly prolong the service life of the measuring sensor.

Abstract: An exhaust gas sensor which is exposed to exhaust gas, includes a measuring electrode; and a porous ceramic coating provided on the measuring electrode and comprised of at least two layers, a first porous ceramic layer which is provided on the measuring electrode and at least a second porous ceramic layer which is provided on the first porous ceramic layer and which is directly exposed to the exhaust gas, wherein the first porous ceramic layer contains getter substances for removal of substances that are harmful to the measuring electrode, and wherein the second porous ceramic layer is provided with one of a diffusion resistance or a catalytic effect relative to exhaust gas constituents such that, at the boundary of the first and second porous ceramic layers, a gas composition is present in use which is comprised of one of oxidizable or reducible gas constituents and which sets a control position for the exhaust gas sensor.

Abstract: A gas measurement sensor (10) which sealingly encloses an axially oriented sensor (27) having an elongated, planar shape in the longitudinal bore (19) of its metal housing (11); while the section (27/1) on the gas measuring side of the sensor (27) has at least one sensor element (38) and possibly heating elements, the end section (27/3) on the connecting side is provided with layered contact surfaces (36), which are in contact with the sensor elements (38)/heating elements via strip conductors (37). A connector plug (43) surrounding the sensor (27) on the connecting side consists of a contact element support (44), an opposite wall (45), contact elements (46) and an annularly-shaped spring element (47); because of its mechanical pre-stressing, the spring element (47) presses the contact elements (46) of the contact element support (44) and of the opposite wall (45) against the contact surfaces (36) of the sensor (27).

Abstract: A protective tube of metal resistant to corrosion from hot gas surrounds and is spaced from a closed-end ceramic sensor body within which is an electrical heater. The protective tube extends beyond the end of the sensor body and has an annular groove at its open end, which bulges into the space enclosed by the tube and the outer end of which provides a flange perpendicular to the axis of the tube a fine metal screen may be provided across the open end of the tube for incepting droplets of water that may sometimes be present in the gas to be measured. The open end of the protective tube may be only slightly constricted by the groove or, in another embodiment, it may taper down in a rounded fashion to a narrower opening.

Abstract: To retain a plate-like sensing element, for example made of ceramic, in position within a metallic housing without danger of breakage or loosening under conditions of vibrations or shock or wide swings of temperature and substantial temperature gradients, a metallic housing has a longitudinal opening wherein in which two sealing elements are located, for example made of aluminum oxide. The sealing elements are formed, each, with an internal pocket, for example extending conically outwardly towards their meeting surfaces, to form a chamber. The chamber is filled with a resiliently compressible powder or pulverized material, for example talcum, and separates the elements by a gap (31) extending outwardly to the walls of the metallic housing. The sensor element is passed through slits formed in the end regions of the sealing elements (26, 27) and is retained in position by the compressible powder or pulverized material.

Abstract: A combination of a measuring sensor and protector having a measuring sensor with a housing and having an elongated cup-like protective pipe engaged with the housing. The pipe has a bottom having a convex shape with an inlet opening. The pipe also has at least one outlet opening spaced away from the bottom. A deflector extends inward from the pipe at an acute angle relative to a longitudinal axis of the pipe and away from the bottom so that when gas flows longitudinally within the pipe from the inlet opening, the gas is deflected by the deflector to flow around the deflector to the at least one outlet opening. The bottom also has a boss-like bulging portion projecting outward to form the inlet opening so as to reduce contamination of the measuring element by preventing solid particles in the gas from entering inside the pipe.