Float Switches | How do they work & Selection guide | Tameson

In this video, Max explains how a float switch works and how to select the correct one.
Visit our website for more information or to buy a float switch ► https://tameson.com/measurement-contr...
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Timecodes:
00:00​ - Intro
00:23​ - How do they work?
01:29​ - Different types of float switches
02:14​ - Different types of electrical connections
02:42​ - Outro
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A float switch detects the level of a liquid in a tank or container. It floats on top of the liquid surface and acts as a mechanical switch as the liquid level goes up or down. They control devices like pumps, valves, or alarms to notify users. A common application is a water tank, like in your toilet or rainwater catcher, uses float switches to detect the water level.


A float switch consists of a hollow floating body and an internal switch, also called a sensor. The most common internal sensor is a reed switch. This switch works using a magnet. If the magnet is close to the reed, it creates a closed circuit and the current can flow. If the magnet moves away from the reed, the connection is removed and thus no electricity can flow.


The float switch itself floats on top of a liquid. As the liquid level goes up or down, it moves vertically with the liquid level. The switching point is determined by the length of the cable up to the counterweight. It will eventually be more vertical, causing a magnet to fall to with gravity, to either come into contact with the reed switch or away from it.


There are different types of float switches. They are available with internal counterweights, which float on the liquid. They are also available with an external counterweight. Here the counterweight is mounted at a preset height. Finally, there are also switches without counterweight, these are then fixed with the cable in the tank or basin by means of, for example, ty-reps.


Depending on the counterweight and the length of the cable, the magnet makes contact with the reed switch or the contact is removed so that the switch opens or closes. This allows an electrical current to flow to the connected device or, on the contrary, disconnects the connection.

Typically, the switch is installed in a tank and connected to a pump so that it is used to stop or start the flow of fluid. They are also available with different types of electrical connections. You have normally open and normally closed float switches and switches with a changeover contact. Here you can choose whether the switch switches on or off when a contact is formed with the reed switch. This gives you more freedom on whether your device should switch on or off with a full or empty tank.


If you thought this video was helpful, give it a like and subscribe for more! And if you have any questions about float switches or any other product. Please contact me or anyone else from Tameson!
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