| 摘要 |
PURPOSE: A method is provided to measure oxygen content of a measurement gas in a wide band range of a lambda value 0.8 to approximately 20 in as accurate and as simple a manner as possible. CONSTITUTION: A method for determining the oxygen content of a measurement gas using a sensor having an oxygen ion-conducting solid electrolyte(1), which separates the measurement gas from a reference gas, and having at least one reference electrode(3a,3b) on its reference gas side and a first and a second measuring electrodes(4,5) on its measurement gas side, and a first measuring electrode(5) covered by a diffusion-limiting layer(6), comprises operating a first measuring cell, which is formed by the covered first measuring electrode, the solid electrolyte and the reference electrode(3a), according to the limiting current principle, operating a second measuring cell, which is formed by the second measuring electrode, the solid electrolyte and the reference electrode(3b), and determining the oxygen content of the measurement gas in a serial manner by the first measuring cell(3a,1,5,6) and the second measuring cell(3b,1,4). The oxygen content of the measurement gas is determined by the second measuring cell(3b,1,4) in a lambda range of 0.8 to 1.4 and is determined by the first measuring cell(3a,1,5,6) in a lambda range of >= 1 to 20.
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