Measuring sensor for determining the concentration of a gas component in a gas mixture

Measuring sensor for determining the concentration of a gas component in a gas mixture, in particular the oxygen concentration in the exhaust gas of internal combustion engines, held with in a housing (10) sensor element (13) arranged one on a solid electrolyte body (28) exposed to the gas mixture outer pumping electrode (24 ), an inner pumping electrode (25) and a Nemstelektrode (26) einliegen the measuring space formed in one (in the solid electrolyte body 28) (30) and are placed on a common electric potential, and a recess formed in one (in the solid electrolyte body 28) reference gas channel (33) inset reference electrode (27) and a between the sensor element (13) and inner wall of the housing (10) pressed-in seal (14), which has a large insulation resistance greater than 1 M, and the sensor element (13) against the housing (10) sealing gas-tight, characterized in that the seal (14) to the electrical potential connected to the inner pumping and Nernst electrode (24, 26) by applying to the surface of the sensor element (13) a conductor track (43) is formed, the formed one hand, the seal (14) and on the other hand, on the surface of the sensor element (13), common terminal-contact area (211) for the inner pumping and Nernst electrode (24, 26) contacts.