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New to reed switches and reed sensors? This section gives detailed information right from the basics of reed switches like how they work to the more advanced topics like magnet selection, and contact protection. A glossary section with meanings to the most widely used reed switch terms is also available. This whole section is available as one PDF file here.
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What is a reed switch ? What is a reed sensor ? How does a reed switch work ? What magnetic force is required to close a reed switch ? What are the advantages in using reed switches ? ...
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How does operate AT affect actuating distance ? How does release AT affect releasing distance ? Should I use a high or low AT reed switch ? What is the maximum rated current and voltage I can switch ? ...
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Characteristics
When a reed switch is actuated by a permanent magnet, the ON-OFF region differs depending on the type and OAT of the switch, and size and power of the permanent magnet...
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In general, there are four families of magnets available commercially. Factors such as operating temperature, demagnetizing effects, field strength...
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Physical Modifications
Cropping the leads of a reed switch removes low reluctance iron and introduces high reluctance air into the magnetic circuit, much the same as adding resistance to...
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Contact Protection
When a reed switch is to be connected to an inductive load or a load where surge current or in-rush current flows (such as a capacitive load or a lamp load)...
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Reed Switches and Reed Sensors are used along with resistors or special reed sensors with an integrated resistor on PCBs to give out a potentiometric feed back across two outputs as a foamed magnetic float moves along its length. The PCB tracks can be designed in such a way...
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Reed Switch Test Procedure
Sample circuits for measurement of ampere turn values and static contact resistance of reed contacts. Test coil and reed switch should be vertical, or if horizontal, only in an east-west direction, to null the earth's magnetic field...
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Life Testing and Life Expectancy
Information on life testing reed switches. A life test is a destructive test conducted to ensure the reliability of reed switches for different combinations of voltage...
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Glossary
Ampere turn, bounce, bounce time, carry current, differential, hysteresis, drop out, dwell, dynamic contact resistance, operate AT, operating time, operating temperature...
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