| 摘要 |
A method for determining ends of runs in a vacuum concentrator includes operating the vacuum concentrator at a pressure set point, periodically inducing a pressure increase in the vacuum concentrator, and determining an end-of-run state from a pressure vs. time relationship. In one embodiment of the present invention, the pressure increase is induced by opening the vacuum concentrator to atmosphere, and the end-of-run state is determined by measuring the time required for the vacuum concentrator to return to the pressure set-point. In another embodiment of the invention, the pressure increase is induced by isolating the vacuum concentrator for a defined period of time, and the end-of-run state is determined by measuring the pressure increase over that period of time. The end-of-run state may be determined by comparing the measured value to a threshold value or by comparing a measured rate of change to a threshold rate of change.
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