How to wire Grainger float switch to control top off?

[AvonleaPA]

I recently bought two Madison brand float switches from Grainger: http://www.grainger.com/Grainger/produc ... 1611760105

Here is my question: How can I hook them up to not only pump water into my sump from a holding tank, but also turn off the pump when the level gets too low in the holding tank?

I can figure out how to hook it up to fill the sump, but I get really confused when I think about the same pump being controlled by two float switches.

I'll be using a mini-jet 404 submerged in a 10 gallon poly tank next to the sump. The float switch in the sump will obviously turn the pump on, but I want the power to the pump to cut off if the level of water in the poly tank gets too low.

Can anyone help...please?

 

[texasreefer]

Wire the switches in series to the hot wire so if either switch opens it's contacts it will kill the power. For the sump level switch you set the switch up so when the level rises the contacts will open, and for the top off tank set the level switch up so the contacts open when the float drops below the set level.

The safest way to wire it up is to use a relay. You use the switches to kill the power to the coil, and then use a set of normally open contacts on the relay to power the pump. If you need adiagram on how to wire it up let me know I have a .PDF file I can send you on how to do it.