Re: Baffled by Honeywell proximity sensor

From: Jamie (jamie_5_not_valid_after_5_Please_at_charter.net)
Date: 12/31/04 

Date: Thu, 30 Dec 2004 22:53:52 -0800

larwe@larwe.com wrote:

> I've been given a sample Honeywell capacitative proximity sensor by a
> client. He wants me to build a small micro-based project to interface
> with it. The sensor is shipped in a bag labeled "992AA12AN-A2", and the
> documentation for "992 series" sensors consists of four letter-sized
> sides, most of which are multilingual translations of warnings and
> mechanical specs. The electrical documentation supplied with this
> sensor is a quarter-page and not very meaningful to me. I've
> photographed it at http://www.larwe.com/honey.jpg - sorry for the nasty
> photo, my scanner is being recalcitrant.
>
> The device has a blue wire, a brown wire and a black wire. Looking at
> those diagrams - I presume they relate to different versions of the
> sensor - I assume that the blue wire is supposed to be +ve, the brown
> is -ve, and the black is output. But when I connect a 10VDC supply and
> a scope, all I see on the output is 60Hz hum. I added a 500 ohm
> resistor between the "output" line and ground, and still all I get is
> hum. The device also doesn't seem to be drawing any appreciable
> current.
>
> The only info I can find on the web is a bunch of people offering to
> sell me the data***, and one company saying that they have stopped
> selling it and now sell someone else's sensor.
> Does anyone know how these devices are supposed to work?
>
normally, the Blue is the common, brown is the Vcc and black is the load.
this depends on what kind you have.
  you have the difference of PNP and NPN which indicate in which manner
it works, either it it pulls towards - side of the + side.

   in any case the BLACK wire will switch the path as you need in the doc.