A float switch is a level sensor that is used to detect the levels of liquid in a tank. There are different types of float switches that come with their specific nature of use and benefits.
Reed switch and mercury switch are examples of the different types of float switches available in the market.
A water-level float switch is used to control the flow of water in fields and mills. The traditional uses of float switches are now replaced with the modern devices that are responsible for switching an electric circuit.
The hermetically-sealed body of the float switch comes with contact leaves that are designed to move together or apart with the application of a magnetic field. A current flows through the closed leaves at the time of contact when they detect switching signal.
Since the contact leaves are under the influence of a mechanical preload, they require a magnetic field to open or close. This allows them to generate the switching signal. The signal depends on the position of the float body, making it imperative for the user to place it in the right manner.
Some experts also use a rod through a stuffing box to operate the switch. However, this leads to a high drag and can cause leakage. The float switch is designed to function according to the changing levels of the float. Some applications can also require custom multi-level float switches, in which the switching signals can be set for specific float levels.
Different factors affect the purchase of float switches. The process connection, the length of the guide tube, and the electrical connection are some of the main factors that specify a float switch. The material and the contacts are also parameters that you should look for.
The applications of float switches are diversified. Hence, you should ensure that you choose one which suits the purpose you need it for.