Hall effect or proximity sensor?

G

Glenn Ashmore

Guest
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: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
 
"John Popelish" <jpopelish@rica.net> wrote in message
news:421D0203.6599409B@rica.net...
The key word you need to add to any other search
parameters is [tutorial].
Click to expand...
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: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
 
On Thu, 24 Feb 2005 00:06:27 -0500 in sci.electronics.basics, John
Popelish <jpopelish@rica.net> wrote msg <421D60D3.903AB07@rica.net>:

re:[tutorial]
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.
Click to expand...
Capitalism, the bane of Google. :) IMO, I think your idea is good.

--
Al Brennan
 
Glenn Ashmore wrote:
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: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
Click to expand...
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].

--
John Popelish
 
Glenn Ashmore wrote:
"John Popelish" <jpopelish@rica.net> wrote:

The key word you need to add to any other search
parameters is [tutorial].

Some of you guys are very helpful but a few are down right condecending.
The title of this group is sci.electronics.BASIC.
Click to expand...
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.

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.
Click to expand...
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.

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com
Click to expand...
--
John Popelish
 
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