| 摘要 |
A liquid level switch for maintaining the liquid level in a container between upper and lower limits. A first electrode extends into the container to the upper limit and a second electrode extends into the container to the lower limit. A single active circuit element coupled to the electrodes continually monitors the liquid level and controls a pump to maintain that level between the upper and lower limits. The electrodes are mounted within a cup-shaped housing having an open bottom for receiving the liquid upon bottom first insertion of the cup whereby an air pocket trapped within the cup prevents the liquid from rising into the upper portion of the cup to eliminate false indications caused by the liquid clinging between the electrodes.
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