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Float switch

A float switch is an electro-mechanical switch which allows for an electrical switch to be opened or closed depending on the fluid level in a container. The float switch allows for automatic operation of devices depending on the level of fluid, such as the operation of pumps, or the opening or closing of valves. Float switches of numerous configurations have been used for various marine and industrial applications. Most float switches contain an electrical switch imbedded within the body of the float switch device. The electrical switch is actuated upon physical movement of the portion of the float switch device containing the electrical switch or upon physical movement of another portion of the float switch device. Such switches typically include a base member having mounted thereon a buoyant arm or float member. They may be physically integrated with the devices they control, or physically independent and connected to those devices only electrically. Electrical circuit and switch means are associated with the arm or member and are responsive to the angular position thereof, whereby the electrical switch means opens and closes as the angular position varies. Typically, changes in the angular position of the arm or member due to changes in water level cause an electrically conductive ball or fluid, such as mercury, to move between switch ON and switch OFF positions to permit or preclude the flow of current through the electrical circuit means.

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