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Float Switch Selection - What You Need To Know?

Alan Butcher Components Ltd News and PR from Alan Butcher Components Ltd - Published 02 May 2019 There are several things to consider when selecting a float switch. This guide from Alan Butcher Components runs through a few of the key points.
Firstly, it is important to understand how a magnetic float switch works. Float switches are also known as liquid level sensors. They contain a hermetically sealed reed switch within a stem. As the liquid level rises or falls, an external float passes the switch. The float contains a magnet which activates the switch, turning on a low level or high level alarm, pump, indicator light or motor depending on the application.

Each application has different requirements and below are a few of the key points to consider:

Contact Form - Normally Open or Normally Closed?
Is the switch required to turn on when the liquid level reaches a certain point (Form A Normally Open) or turn off (Form B Normally Closed)?

Mounting Position – where will your float switch be placed within the application? This may determine whether you need a vertical or side mounting/horizontal float switch.

Housing Materials – what type of fluid will the level sensor operate in? It is strongly advised that a sample switch is tested during the early stages of the design. An incorrect material choice may lead to product failure.

Electrical Rating – what is the electrical load of the application? The float switch may control a pump or a small piezo buzzer and the switch must be capable of handling the power requirements.

Lead Length and Lead Material - level sensors are fitted with wire leads and it is important to know the length required. Also, will the wire material be affected by the fluid.

Size of Tank/Container – The size of the tank will determine the size of the magnetic float switch required.

These are some of the variables to review when selecting a float switch. For more detailed information, please visit our webiste

or call 01258 456360.
Alan Butcher Components' guide to selecting a float switch.

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