How does a double float switch work?
The Double Float® pump switch is designed to directly control pumps up to 1 HP at 120 VAC and 2 HP at 230 VAC in non-potable water, water and sewage applications. Each float contains a heavy-duty mercury switch. The splice tube contains a holding relay which enables the floats to function in series.
What is a double float switch?
The double float switch consists of two mechanical floats and a splice tube. The splice tube contains a holding relay which enables the floats to function in series. The holding relay eliminates pump chatter in turbulent conditions, allowing the switch to operate relay control panels for larger pump applications.
How do you open a float switch?
Normally closed float switch: The electrical circuit is closed in the down position and open in the up position. So, with gravity pulling it down it is closed and as the liquid level rises to the pre-set level it will open.
How many types of float switches are there?
two types
There are two types of float switches: stem-mounted float switches and cable-suspended float switches.
What does the first switch on a float pump do?
The first switch (L) is set at the minimum liquid level desired in the tank. The second switch (H) goes at the maximum desired level. When the liquid is below both switches, they are both closed; the pump runs, filling the tank.
What happens when the low level of a float switch is closed?
This cyclical action is called hysteresis. Once the liquid level falls below the low-level switch, the pump will run until both switches are open. The liquid level can fluctuate up and down, the low-level switch can open and close, and the pump will continue to run smoothly.
How many wires do you need for a float switch?
The low-level switch wires to terminals 1 and 2, the high-level switch to terminals 3 and 4, and the contacts for seal-in relay A to terminals 5 and 6. So that’s at least four, if not six, wires that need to be hooked up to the control circuitry. (Wiring for the seal-in relay and contacts will depend on your control equipment.)
Do you need a seal in relay for a float switch?
As with the seal-in relay above, the wiring necessary for the alarm contact will vary based on your control equipment. All that is left is installing the switch per the manufacturer’s instructions for your desired levels.