motion sensing inductive proximity switch

[jd1rose]

Looking for help locating a source for motion sensing inductive proximity switch. This will detect when a object has stopped or has dropped to a very slow speed. Have had some info in a Telemecanique brand. I have had no luck with a source.
Thanks
Roy.

 

[jraef]

You need to define the distances you are looking for. 30MM is a completely different product group from 30M!

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[jd1rose]

it will come in to approx 1/4" to 1/8" inch, and move out 1" inch


Thanks
Roy

 

[HCBFlash]

Source? Telemechanique is part of Merlin Gerin along with Square D. You'll need to find a supply house (like CED, Graybar, NorthCoast, Platt, WESCO, etc...) that handles Square D/Tele. There are of course many other makers and suppliers for these types of sensors. You may in fact be wisest to buy a sensor that your choice of supplier recommends, or at least has in stock or can get readily.

You don't say what country you're in for that matter.

Are you looking for a "smart" sensor or a basic sensor to be used with your own controller and logic for delays etc.? (An inductive sensor doesn't only detect moving objects)

What precisely will you be sensing? At what distance? How quickly? What current and voltage are your control circuits? How many sensors will you need?

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[jd1rose]

I'm in the USA
I wil travel from 1/8" when it will sence to about 1" where it will break sence. I want to sence a bolt head.
Hope this helps.
Roy

 

[cbarn24050]

Most proximity switches operate on distance not motion, as your posts seem to differ in requirements maybe you could clear up just what you want.

 

[HCBFlash]

did you see thread237-170950?

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[nbucska]

jraef:
You are right 30 million meters are different from
30M which is a pure number.
( m=milli, M=Mega !!!!)

Plesae read FAQ240-1032
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[nbucska]

You have to specify what "stopped" means in numbers.
To sense the stopping, you have to differentiate the
position signal and sense its zero crossing -
And zero can't be accuratelly sensed.

Differentiation amplifies the noise, so it would be nice
to ubderstand what you are trying to do.


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[HCBFlash]

You need to consider your "target"s size in comparison to the range of motion you mention, as well as the background. Sensing the head of a 1/4" stainless socket head capscrew through a range of 7/8" is quite a bit different than a 5/8" hex head grade 5 bolt. Your sensor obviously has some histerysys., and the direction of travel relative to the sensor will certainly come into play.

The actual movement itself is not something sensed directly by a prox switch, it is typically determined by how long the target is sensed in a given location, or moves past multiple points. The older Banner photocells spring to mind as sensors that could be fitted with various different modules to in effect provide embeded logic. There are tons of similar sorts of sensors, and perhaps this is what you're looking for, or assuming is just a part of a proximity sensor. Personally I've usually kept controls and logic "in the cabinet" as opposed to having to do changes and adjustments to settings at the sensor itself.

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