What are float level switches?
Float level switches are sensors that are used inside a tank to detect the level of liquid reaches the preset setpoint. There are different types of float switches available in the market used according to the purpose, but their general purpose is to activate pump control panels and any alarms if needed.
The float rides on the liquid surface of the process, precisely monitoring the movement of the liquid surface. The rising liquid level lifts the float, sliding the attraction sleeve into the enclosure tube and into the magnetic field to activate the electrical or pneumatic switch (signaling the presence of liquid).
The falling liquid level subsequently lowers the float, removing the attraction sleeve from the magnetic field to deactivate the electrical or pneumatic switch (signaling absence of liquid).
Different types of Float level switches:
There are different types in float level switches, classified based on the working principle of the level and mounting positioning.
Considering the mounting positioning of the float there are horizontal and vertical float switches.
Horizontal float switch:
Horizontal float switches are mounted at the side walls of the liquid tank, used where the top and bottom of the tanks are inaccessible.
Due to the changing liquid level, the float’s movement will cause the reed switch to operate at a certain level (i.e. close or open). This tried and trusted technology is based on a relatively simple design that offers reliability in the long term without the user having to calibrate the switch.
Pros:
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Flexible & good economic choice
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Can be used with alarms of high-level or low-level alarms.
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They can be mounted internally or externally to ensure exact placement
Vertical float switch:
The vertical float switch is a vertical arrangement of two floats. This is a type of magnetic float.
One of the floats is fixed and attached to the top of the tank, and the other is movable with respect to the liquid level. Either one or more hermetically sealed reed switches inside the tank and wires outside the tank.
Due to the changing liquid level, the float’s movement will cause the reed switch to operate at a certain level (i.e. close or open). This tried and trusted technology is based on a relatively simple design that offers reliability in the long term without the user having to calibrate the switch.
Since vertical switches can be mounted through a container’s top or bottom, they are particularly suitable for situations where side access to the tank is not available.