Answer
The dual float switch actually works on a timer once the float is raised a 1/4" from it's original position. Once the float is raised, it will activate the pump. Once the float is back in it's original position, the pump will operate for an additional 10 seconds and stop until the pump is activated again. You can set the level at which you want the pump to activate however.
Per the instructions for the Pro Series S3100:
Position the float switch to a level where the bottom of the float cage is no lower than 3 above the bottom of the pump and no higher than 1 below the top of the pit. To avoid debris pouring into the float, it should be positioned on the side of the discharge pipe opposite the drain tile. Note: It is important to mount the float below the drain tile that empties into the pit. Mounting it above the drain tile would allow water to fill the drain tile before the pump is activated to pump out the water.
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