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Float switches are level sensors that float on a liquid surface. A float switch consists of a hollow float body containing a sensor. When the liquid level falls or rises, the float switch moves up or down accordingly. Read More…
Float SwitchesThis can be used for a wide range of applications and is found in a number of different applications. Typically, a float switch is made from mercury and is activated once the float switch reaches a certain angle or level.
A distributor of industrial instrumentation & process controls, representing top level switch manufacturers, such as Magnetrol. Precision level monitoring instruments & flow controls, float liquid level switches, magnetic switches & indicators, and new level switches & transmitters with radar technology.
FPI Sensors manufactures standard and custom liquid level sensors. Our capabilities include single and multi-level float sensors, side mount, leak detection, continuous measurement, field adjustable products and custom applications. We have technology in capacitance, optical sensing and float type switches.
Vega Inc. has been a leader in the level switch industry for over 60 years. We serve a wide range of industries including industrial, chemical, and energy. With plants in over 80 countries, we are one of the best in the industry worldwide.
A magnetic device tracks a float switch's movement. A counterweight and a pre-set trigger open the mechanical switch to transmit an electric current to a connected device. This connected device triggers an alarm or turns a pump on/off. A float switch offers a reliable, simple solution for measuring liquid levels.
Types of Float Switches
The different types of float switches include:
Stem-Mounted Float Switches
Stem-mounted float switches use a magnet inside of a float. As liquid fluctuates, the magnet passes over the reed switch. Stem-mounted float switches operate on a "one-float-one-level" basis, moving a float up and down a stem. This is operating on a one-float-one-level basis. Some stem-mounted float switches are simple or complex depending on the number of floats attached to the single stem. Stem-mounted switches are most suitable for smaller spaces.
Cable-suspended Float Switches
Cable-suspended float switches have both the magnet and the reed switch in the float. They are tethered, so the float switch doesn't move with the flow inside the tank. As a result, cable-suspended float switches are more electronically diverse than their counterparts. The complexity of cable-suspended float switches depends on the switch points.
For example, simple cable float switches use a single point to control the switch, while complex switches can consist of up to four switch points. As a result, they are well-suited for spaces with wider hysteresis bands.
Two Stage Switch Float Switches
Float switches with a two-stage switch will trigger two actions as the liquid rises. The first trigger will activate a pump if the liquid rises to the next trigger. There are customizable options for the next action.
The second stage may switch off the liquid source, trigger an alarm, or both. Float switches must be custom-made since their needs vary greatly on a commercial level based on the unique requirements of the end user.
Vertical Float Switches
Vertical float switches have two parts – the stem and the magnetic float. They can either have a stainless steel or plastic ball mounted at the bottom or top of the tank. One of the two floats moves with the liquid level inside the tank, while the other remains attached to the top of the tank.
Horizontal Float Switches
Horizontal float switches are perfect when they have limited access to the top or bottom of the tank. Horizontal float switches are mounted on the side of a tank using a hinged float. The horizontal float switch falls and rises with liquid levels. The movement of the float causes the switch to open or close the circuit.
Applications of Float Switches
Float switches are most commonly applied in sump pumps and condensate pumps. In these applications, the switch detects the rising liquid level in the sump or tank and then energizes an electrical pump. This energized electrical pump then pumps the liquid out until the liquid level has been reduced substantially, at which point the pump is switched off again.
Benefits of Float Switches
It's easy to mount and retrofit float switches.
System calibrations can be made online.
Gauge, switches, and transmitters use the same hardware
There is the possibility of continuous level measurement, even during power failure
Float switches provide a simple, reliable, and effective level measurement solution.
Float Switch Informational Video
Level Switches Power Pages
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