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How does a Reed Switch work?

2022-09-20 19:41:09 bailing 11


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How does a Reed Switch work?

A Reed Switch consists of a pair of ferromagnetic reeds, overlapping at their free ends (contact area) at a very small distance and hermetically sealed in a glass tube. The contact area is plated with contact material such as Ruthenium or Rhodium. In presence of a magnetic field the reeds become magnetized the opposite polarity, thus attracting each other and closing contact.

ACTUATING A REED SWITCH

In general four different magnet approaches are known when using permanent magnets.


ONE POLE ACTUATION

One magnet pole faces Reed Switch providing two operations max. when moving on X-axis. Minimum movement of magnet over switch center provides smallest possible switching differential.



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TWOPOLE ACTUATION

Approaching magnet vertically to switch on Y-axis provides one operation only. Driving magnet over the full length of the switch (X-axis) may result in up to three operations. Minimum movement of the magnet over switch centre provides the smallest possible switching differential.h.Properties and behaviour of Reed Switches and Reed Sensors.


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ROTATION

Rotation of the actuating Magnet: Two switching cycles per full turn of the Magnet.


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SHIELDING

Operation of switch by shielding. This method requires a permanently opposite location of magnet and switch. The switch is held closed continuously and will release only if magnet flux is removed by means of ferro-magnetic shield.


Beelee,Vibration sensor,tilt sensor,hall sensor,reed switch,shock sensor,Button switch,Micro swithc,Tact switch,Buzzer,Potentiometer



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