| 摘要 |
A float switch apparatus for controlling the energization of multiple electric circuits in response to the level of a liquid in a vessel, and a pump system incorporating same, are provided. The apparatus has a guide structure adapted to be mounted in a fixed position relative to the vessel. A first micro-switch with a normal and an engaged position is mounted to the guide structure and is adapted to be connected into a first electric circuit to control the energization thereof. A second micro-switch with a normal and an engaged position is mounted to the guide structure at a location above the first micro-switch and is adapted to be connected into a second electric circuit to control the energization thereof. A float rod is slideably mounted to the guide structure for reciprocating movement in a generally vertical direction in a zone above a resting position. The float rod has upper and lower float stops and a lower cam surface for releasing the first micro-switch from an engaged position to its normal position during upward movement of the float rod above the resting position. The float rod also has an upper cam surface for moving the second micro-switch from its normal position to its engaged position during upward movement of the float rod. The float, adapted to float with the level of liquid in the vessel, is slideably mounted to the float rod between the upper and lower float stops.
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