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14470 Views 4 Replies Latest reply: Jun 12, 2014 6:24 AM by verai RSS
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Nov 20, 2012 12:15 PM

Hall Effect Sensors or Reed Sensors?

How do I know whether my application is better suited to a Hall effect sensor or a reed sensor?

  • VanessaW Novice 13 posts since
    Oct 5, 2012
    Currently Being Moderated
    Nov 21, 2012 1:08 PM (in response to electrogeek)
    Hall Effect Sensors or Reed Sensors?

    Although they are both magnetic proximity sensors, Hall effect sensors & reed sensors are significantly different in the way they function.  A Hall effect sensor is a three-wire, solid-state device whose output changes when exposed to a magnetic field.  A reed sensor, on the other hand, is electrically a switch, with tiny contacts that open or close in the absence or presence of a magnetic field.  In many applications either device could be used, but there are also some situations where one technology may be preferable over the other.  A Hall effect sensor may be preferable to a reed sensor if you have the following requirements:

     

    - Unlimited life.  For example, if you are interested in sensing a spinning magnet that will operate a sensor billions of times, you should consider a Hall effect sensor.

     

    Reed sensors generally have very long life compared to other electro-mechanical devices, but they cannot match the virtually infinite life of a Hall effect sensor.

  • MetMan Apprentice 93 posts since
    Oct 24, 2011
    Currently Being Moderated
    Nov 28, 2012 3:30 PM (in response to electrogeek)
    Hall Effect Sensors or Reed Sensors?

    I would add that Hall effect sensors are 3-terminal powered devices that usually require a 3V or 5V power supply and usually in the range of 10-20mA although some lower power Hall effect sensors have been released recently.

     

    The reed switch being mechanical has only 2-terminals and requires no power to operate and so can be simpler to implement.  Some newer reed switches are also rated for billions of cycles.

  • Melissa_Sue Novice 13 posts since
    Nov 19, 2012
    Currently Being Moderated
    Dec 27, 2012 10:30 AM (in response to electrogeek)
    Hall Effect Sensors or Reed Sensors?

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