Sensor Magnet Selection

Sensor Magnets, electromagnets and solenoids could all be used to trigger magnetic sensors such as Reed Switches and Hall Effect devices. The choice of magnet is determined by the actual application and the environment of the application. Temperature, distance and location of the magnet, presence of other magnetic field sources and the presence of any ferromagnetic materials all need taking into account.

To activate a Reed Switch or Hall Effect device requires selecting the correct size, shape and grade of magnet for the application (to give the required magnetic field strength at the distance away from the magnet). If you have a magnet that works but you need to change how your application is activated, we can assist you.

We can help you specify the required magnet and we can produce and supply stock and custom produced magnets (to all the magnet material types, grades and coatings we currently offer).

SENSOR MAGNET SELECTION - SIZE GUIDANCE
Magnetic field drops off quickly the further away the sensor is from the magnet.
To gain more field at the sensor, reduce the distance from magnet to sensor if possible.
To gain more field at the same distance increase magnet diameter.
To gain more field at the same distance increase magnet height (gain does plateau off with increasing height works well for thin magnets).
To gain more field at the same distance increase magnet Br (i.e. select a stronger magnet grade or even a stronger magnetic material if feasible).