Near Intersection of I-35 & I-90 Southern Mn. | How about one of these? I purchased one because I thought it was a clever design but have not needed it yet.
The idea is that the rectangular portion floats. The circular piece goes over the cord and grips the cord at a position of your choosing. This allows the cord itslef to become a tether and an attaching point. The float is placed in the area of concern and its cord is tethered to a fixed location. It has a switch and a ball inside. The float will attempt to float on the surface and rise/fall with the water level.
This means that as the water level rises, the float will rise but eventually tip upward due to the tether. The internal ball then rolls toward the internal switch and activates it. This could start your pump and cause it to continue to run. The pump will eventually lower the water level to a point where the float will float level but eventually tilt downward due to the tether. The internal ball will then roll away from the switch which will cause the pump to stop.
Both the height of the tether attaching point to a fixed object and the length of the tether (the cord itself) determine the operating characteristics. Some Trial & Error may be necessary to get the level height, the start and stop points to your satisfaction. If the length of the tether is quite short, the pump might start/stop too often. Lengthening the tether would cause the start/stop points to change and result in a longer run time between start and stop. If the tether is too long, the float could possible encounter some other obstacles.
The cord has three wires in it. They are: Common, Normally Open and Normally Closed. You would use the Common and one of the others.
You would use the Common and the Normally Open wires for situations where you want the pump to start when the water level gets high but stop when the water level is low.
You would use the Common and the Normally Closed wires for opposite situations such as if you are using a pump to fill a container. Then the pump will run when the level is low but stop when the level gets high,
There may be a problem if the surface area is small which would prevent the float from floating freely during its complete range of travel. One would need to analyze the situation. I don't think I would use it to fill an open water tank for cattle unless the float was out of reach of the critters.
https://images.search.yahoo.com/yhs/search?p=floating+pump+switch&fr...
Edited by tedbear 3/18/2026 06:40
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Laser sump pit float?