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Reed Switch Magnet Interaction Slide 19

Rotating the magnet from parallel to perpendicular will cause the contacts to go from a closed state to an open state. If one continued to rotate the magnet the contacts would open and close after each 90° rotation. Many applications use this approach to count rotations of mechanisms that in turn translate the rotations to specific functions. One common application is in water filters. As the water flows a magnet is rotated. Counting the rotations allows one to keep track of the amount of water filtered, eventually indicating it’s time to change the filter.

PTM Published on: 2012-03-21