Float Switch Kit: Empty Tank Shut-Off

More Information
Item Number: DSP-11002
Last Price Update: 06/16/2022
Manufacturer: Dankoff Solar
Made In: United States
Model Number: DSP-11002

The Dankoff Solar Float Switch is designed to automatically start and stop the Dankoff Solar Pump based on the storage tank level. This model will signal the pump to shut off when the water level is low in the storage tank and signals to stay on when the tank is full. You would probably be using this with a pressure tank and switch, and use this to simply shut the pump off when the tank runs out of water.

Empty tank shut off is closed when down, open when up. So if it is connected directly to a pump, the pump will turn off when the tank is full. If it is connected to a LCB, it will turn the pump off when it is empty.

Float Switches Pump Up vs. Pump Down & Normally Open vs. Normally Closed Explained.

A Pump Up opens the circuit on the rise.

A Pump Down closes the circuit on the rise.

Sometimes the terms Normally Open and Normally Closed are used to describe float switches.

Please use the following identities:

Normally Open = Pump Down

Normally Closed = Pump Up

A pump with an LCB (Linear Current Booster or pump controller, used with all PV-direct

Dankoff Solar surface pumps except the SunCentric) will continue to run when the float switch circuit is open. With an LCB, a closed float switch circuit will shut the pump off.

With no controller:Pump will not run when circuit is open. Pump will run when circuit is closed.

So, to shut pump off when the tank is full:

Use Pump Up when no LCB is used.

Use Pump Down when using an LCB.

To shut pump off when the tank is empty:

Use Pump Up when using an LCB.

Use Pump Down when no LCB is used.

As of 11/27/2007:

All our float switches are certified safe for drinking water applications, EXCEPT those rated for 25 Amps (DSP-11007 and DSP-11009). The 25A units contain mercury and risk contaminating the system if they were to break.

Windy Dankoff says; the current ratings that we give to the float switches we sell are based on 28VDC operation. So, the rating for our float switches are really only for 24VDC nominal systems and the current ratings should be halved when used with 48V systems.

This ratio is not precise, but it has shown itself to yield accurate results. Keep in mind that the current rating of a float comes into play only with SunCentric pumps. All other Dankoff Solar surface pumps use an LCB when in PV-direct systems. In these cases the float wires connect to the LCB float terminals, and the power to the pump does not pass through the float.

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