| 摘要 |
<p>57 An electrochemical device for measuring oxygen partial pressure of a measurement gas has a sensing cell which comprises a first planar solid electrolyte body 4, a first and a second porous ele6trode 20, 22 on the first electrolyte body, the second electrode being exposed to a reference gas, and a member 2 which has a predetermined diffusion resistance to a measurement gas and covers the first electrode. An electric current is applied between the first and second electrodes, to induce an electrode reaction to control the atmosphere adjacent to the first electrode. To make the device capable of measuring not only oxygen partial pressure of lean-burned exhaust gas but also the amount of unburned components in a rich-burned exhaust gas, the device has a pumping cell which comprises a second planar solid electrolyte body 8, and a third and a fourth electrode 24, 26 of porous structure on the second electrolyte body. The third electrode is exposed to the said reference gas and the fourth electrode is exposed to the measurement gas. An electric current is applied to flow from the third electrode to the fourth electrode, whereby an oxygen component of the measurement gas is moved into the reference gas.</p> |
