Abstract: A gas sensor for detecting at least one physical magnitude of a gas, in particular of exhaust gases of an internal combustion engine, is proposed, which includes a sensor element having an electrochemical cell. The electrochemical cell includes a first solid electrolyte member on which a first electrode and a second electrode are applied. The first and the second electrode are electrically connected by means of the first solid electrolyte member. The first electrode is in contact with the gas. The area of the first electrode is smaller than the area of the second electrode.

Abstract: The ceramic sensor body, held inside a housing by a sealing packing, is provided with a circumferential coating of an electrically insulating material in the region of the sealing packing, so that the sensor body remains potential-free with respect to the housing, even when a sealing packing is used that is made of a material having poor electrical insulating qualities. In this manner, a glass putty is used for the sealing packing, which, while having comparatively poor insulating characteristics, provides a good sealing effect at high loading capacity.

Abstract: A sensor element for determining the concentration of gas components in gas mixtures, particularly for determining the oxygen concentration in exhaust gases of internal combustion engines. It contains a pump cell, which pumps oxygen into or out of a measuring gas chamber, as well as a concentration cell, which has a reference electrode situated in the reference gas channel, and has a measuring electrode. The measuring gas chamber and the reference gas channel are situated in the same layer plane of the sensor element, and are separated from each other by a partition, which is produced by applying a ceramic paste to an adjacent, solid electrolyte foil.

Abstract: A sensor element (10) for determining a gas component, in particular for determining the oxygen concentration in exhaust gases of internal combustion engines, is described; a measurement gas space (41) is introduced into the sensor element (10), and at least one electrode (31, 32) is provided in the measurement gas space, which is connected to the gas outside the sensor element (10) via a gas inlet opening (43). A diffusion barrier (44) is provided between the gas inlet opening (43) and the electrode (31, 32). At least one spacer element (50, 51) is provided in at least some areas of the measurement gas space (41) and has a higher pore content than the diffusion barrier (44) or it allows access of the measurement gas to at least the areas of the electrode (31, 32) not covered by the spacer element (50, 51).

Abstract: The ceramic sensor body, held inside a housing by a sealing packing, is provided with a circumferential coating of electrically insulating material in the region of the sealing packing, so that the sensor body remains potential-free with respect to the housing, even when a sealing packing is used that is made of a material having poor electrical insulating qualities. In this manner, it is also possible to use a glass putty for the sealing packing, which, while having comparatively poor insulating characteristics, provides a good sealing effect at high loading capacity.