REED SWITCH

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REED SWITCH

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Types of reed switchThere are two fundamental types, �normally open� and �normally closed�. In a normally open switch, the two reeds, which are made from ferrous material such as a nickel-iron alloy are positioned so that they are not touching. When a magnet is moved close to the switch, it pulls one of the reeds towards the other so that they are touching, and therefore completing the circuit. Remove the magnet and the reeds return to their original position breaking the circuit.Normally open reed switchA normally closed switch works in the opposite way, when no magnetic field is present the reeds are in full contact, the electric circuit is complete and the device is �on�. When a magnet is moved close to a switch, or the switch close to a magnet, the reeds repel one another and split apart, breaking the circuit. There is a third configuration that has three contact points, rather than two. In this configuration, the current flows along a common lead which can be toggled between two contacts. The common lead will be in contact with one contact in its normal position until a magnetic field is introduced moving the common lead to be in contact with the other contact. When the magnetic field is removed, the common lead reverts back to its original position.Normally open/normally closed reed switch (Form C)Advantages of using reed switchedThere are many advantages for using magnetically operated reed sensors, including:No mechanical wear�� because there is no physical pressure applied to the switch, there is no mechanical wear and tear.Operated through a non-magnetic material�� sensors can be developed with such sensitivity that they can be embedded deep within an assembly out of sight but still actuated by a reasonably strong but discreet magnet.No supply of voltage�� as they are triggered by magnetism, there is no voltage required.Compact�� reed switches are incredibly compact compared to mechanical switchesAtmospheric corrosion�� as the contacts of a reed switch are sealed within a glass tube they are protected from atmospheric corrosion.

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REED SWITCH

REED SWITCH

REED SWITCH