Float switches are central to what we offer here at SMD Fluid Controls. The devices in a basic explanation include a hollow float, magnet, reed contact, guide tube and retaining collars. Depending on the position of the magnet, when the device is in use it will either pull the reeds apart or force them together. When the reed contacts are forced together it closes a circuit. (See this app note for more details)
Determining Liquid Levels
Float switches are used commonly to determine the level of liquid present, or absent, in a vessel. The sensors are low cost, very reliable and accurate and depending on the material they are constructed of, they can be used in a variety of different liquid media.
Interested in purchasing float switches to meet your project needs? We everything from liquid level sensors, float switches, sump switches, optical sensors and more. We also work with you on custom design and manufacturing.
Going Beyond Liquid Measurement
In addition to measuring liquids, a float switch can control a pump, activate an alarm and even be used to control another electrical device.
One example of the way a float switch can work is sump pumps. Anyone unfortunate enough to deal with flooding issues in a home or business knows that these machines are important to keep water out of the space. But you can’t sit by waiting for the water level to accumulate so you can turn the device on. Instead, a float switch is used to monitor rising water levels and then activates the pump (switches it on) when a threshold is met. Once the level is no longer determined by the switch, the pump will turn off again and continue monitoring for the next occurrence.
Discussing Accuracy
So what makes float switches a tool that’s stood the test of time? Flexibility and reliability. Engineers opt for the devices not only because they can be mounted in different ways and made of materials for use in different environments, but also because they are durable and can do the intended job for a great number of cycles with little need for maintenance.