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Some simple instructions for Float Switch

A float switch is an electrically controlled device that detects the level of liquid in a tank or sump and controls an external component, such as a pump, valve, alarm, or other device. As the liquid rises or falls, the float moves an electrical microswitch that opens or closes, activating or deactivating the device.
Float switches have been used for many years to control liquid levels in a range of industrial applications, from sump pits to sewage systems and industrial washers. Today, float switches have evolved to become one of the most reliable and efficient liquid level control technologies available.
The Most Common Types of Float Switches
Typically, a float switch is designed to operate as a single-pole, single-throw (SPST) switch with a single neutral or negative contact and one common or ground wire. The switch actuates the contacts as the float rises or drops, and then switches the 'up' (normally closed) operation on or off as the liquid level rises or drops to a pre-set, desired point.
In some cases, float switches are user reversible, meaning that you can change the 'normal' operation at any time. Always check the float switch's manual for the 'normal' operation that works best for your application.
Some float switches are also designed to use probes to determine the liquid level in a tank or sump. These probes can be installed at various points in the tank and can trigger a float switch to activate or deactivate a device as the level changes.

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