| 摘要 |
Disclosed is a controller for controlling a pump. The controller includes a sensor unit and a buoy unit. The sensor includes a base, a cylinder extended from a lower side of the base, a micro-switch provided on the base, a ferromagnetic tag connected to the micro-switch and a switch provided on the base. The switch is connected to the micro-switch on one hand and to the pump on the other hand. The buoy unit includes a buoy, a rod inserted through the buoy and a magnet connected to the rod. The rod is movably inserted in the sensor unit through the cylinder so that the magnet attracts the ferromagnetic tag to actuate the micro-switch when the level of sewage reaches an upper limit and that the magnet releases the ferromagnetic tag when the level of sewage reaches a lower limit.
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