| 摘要 |
An analyzer (10) for detecting a selected chemical (such as oxygen) in a process fluid includes a plurality of electrodes (12, 14, 22) that are separated from the fluid by a membrane (18) that is permeab le to the selected chemical, each of the electrodes (12 14) when energized producing a signal in response to the selected chemical i n the fluid. The selected chemical level in the process fluid is determined based on the signal produced by a first one of the electrodes (12) and the determined level is used with the signal produced by a second one of the electrodes (14) to detect whether the membrane (18) has become faulty (e.g., fouled by ma- terials in the process fluid).
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