Connect with us

Hall effect or proximity sensor?

Discussion in 'Electronic Basics' started by Glenn Ashmore, Feb 23, 2005.

Scroll to continue with content
  1. What is the difference between a Hall effect transducer and a proximity
    sensor? It looks like one is general term and the other is a specific type.

    I have a recipe for an anchor chain counter that calls for imbedding a
    magnet in the chain wheel and sensing it with a hall effect transducer with
    sourcing output. I have a selection of Omron proximity sensors with both
    sourcing and sinking outputs that can detect bolt heads and gear teeth and
    don't need the magnet. Can I safely assume that they can be substituted?

    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at:
    Shameless Commercial Division:
  2. A hall effect sensor responds to the external magnetic field in some
    way. It may be a linear response to the field passing through it, or
    it may include a threshold sensor that switches a transistor on and
    off as the field passes through distinct values. If you bias a hall
    effect sensor with a permanent magnet, the combination may be made to
    sense the presence of a ferromagnetic object near by.

    A proximity sensor is a complete system for sensing the presence of a
    particular kind of material. It may be based on an AC magnetic field
    generated by an internal oscillator, and electric field generated by
    an internal oscillator or the variation in the DC field generated by
    an internal magnet. Each type serves best in particular circumstances
    and poorly in others. You really need to read up on how the various
    types work and what their specifications are before designing them
    into a system. The key word you need to add to any other search
    parameters is [tutorial].
  3. Some of you guys are very helpful but a few are down right condecending.
    The title of this group is sci.electronics.BASIC.

    I have been working with proximity sensors for some time and have completed
    several very successful projects. I am familliar with their detection
    capabilities and the signals they output. What I wanted to know was if hall
    effect transducers had some intrinsic advantage. I gather from your
    response that they do not.

    Thanks for that anyway.
    Glenn Ashmore

    I'm building a 45' cutter in strip/composite. Watch my progress (or lack
    there of) at:
    Shameless Commercial Division:
  4. Hey! It took me a long time for me to figure out to add that word
    when I was looking for an explanation of how something worked, instead
    of where to buy something.
    They are good for some applications, but they are not the most common
    industrial sensors. Part of the reason for that may be that good,
    reliable integrated hall devices have not been available until
    recently. One of their short comings is that the permanent magnet
    used to bias them tends to make them accumulate bits of iron. The AC
    field devices do not attract such debris.
  5. Kitchen Man

    Kitchen Man Guest

    On Thu, 24 Feb 2005 00:06:27 -0500 in sci.electronics.basics, John

    Capitalism, the bane of Google. :) IMO, I think your idea is good.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day