Patent ID: 6811664
Filing Date: 2004-11-02
Classification: G01N

Abstract:
A sensor element for determining a concentration of a gas component in a gas mixture, comprising:a measuring gas chamber; at least one pump cell including at least one first pump electrode situated in the measuring gas chamber and at least one second pump electrode situated on a surface of the sensor element facing the gas mixture; a first solid electrolyte layer situated between the first and second pump electrodes; a reference gas chamber; at least one concentration cell including at least one reference electrode situated in the reference gas chamber and at least one measuring electrode cooperating with the reference electrode and being situated in the measuring gas chamber; a second solid electrolyte layer adjacent to the first solid electrolyte layer, in which the reference gas chamber and the measuring gas chamber are situated; at least one barrier layer substantially preventing ionic conduction between at least one of the electrodes of the pump cell and at least one of the electrodes of the concentration cell; a layer level between the first and second solid electrolyte layers, the barrier layer being situated in regions in the layer level, the barrier layer having a cutout in a region of the first pump electrode; and a further reference electrode lying opposite the reference electrode in a reference gas channel, the barrier layer separating the reference electrode from the first solid electrolyte layer.