Magnetic Proximity Sensing

Reed sensors utilize a reed switch encased in a rugged plastic housing. They are actuated by an external permanent magnet.

Contact Forms

• Form A (Normally Open): The switch is open. When the magnet approaches, it closes. Common for door security and fluid level.
• Form B (Normally Closed): The switch is closed (biased by an internal magnet). When the external magnet approaches, it cancels the field, and the switch opens.
• Form C (Changeover): A SPDT switch that toggles between a Common, NO, and NC contact.