Gas sensor i.e. Lambda sensor, has pumping circuit controlled such that voltage converts actuating variable into measurement signal, and evaluating circuit generating current that flows from reference electrode to Nernst electrode

摘要

The sensor has a reference electrode (108) arranged in a reference gas channel (106), and a Nernst electrode (113) provided in a diffusion chamber (111) that is separated from the reference electrode by ions conducting solid electrolyte layer. An outer pump electrode cooperates with an inner pump electrode (115), and an electrical pumping circuit is controlled such that an electrical voltage converts an actuating variable into a measurement signal. A controlling and evaluating circuit (200) generates a current that flows from the reference electrode to the Nernst electrode.