| 摘要 |
PCT No. PCT/DE95/00258 Sec. 371 Date Nov. 13, 1995 Sec. 102(e) Date Nov. 13, 1995 PCT Filed Feb. 28, 1995 PCT Pub. No. WO95/24643 PCT Pub. Date Sep. 14, 1995The invention relates to a device for detecting the oxygen content in a gas to be measured, wherein the device comprises at least one concentration cell which includes a measuring electrode, a solid electrolyte and a reference electrode. The measuring electrode communicates with the gas to be measured and is connected via the solid electrolyte to the reference electrode, which communicates with a reference gas volume. The reference gas volume is separated from the gas to be measured in such a way that a particle exchange between the reference gas volume and the gas to be measured is at least impeded. The output voltage of the concentration cell, which voltage can be tapped off between the measuring electrode and the reference electrode, represents a measure of the difference in the oxygen concentrations in the gas to be measured and in the reference gas volume. The device further comprises a current source which can be coupled in between the reference electrode and the measuring electrode in such a way that in the coupled-in state a current flow results which is directed such that oxygen is transported in the solid electrolyte from the measuring electrode to the reference electrode. The device further comprises switching means which, in a first switching state, couples the current source to the concentration cell and which, in a second switching state, decouples the current source from the concentration cell, so that the voltage between the measuring electrode and the reference electrode in the decoupled state is not affected by the current source.
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