AVR-Chat

Red Lion or Yamitaki Honeywell comes to mind.  Simple
all in one units that have either analog or relay
outputs for heat treat furnaces.  As that's one of
the few things I know of that requires 500C.  You
need the controller and a servo gas valve.  As to the
homebrew stuff, don't.  Things going wrong in a
furnace
make for nasty lawsuits.  I've seen what's left of
a 12 inch door after something goes wrong with the
gas mixture after it took a guys head off.  Yes he
died.

Chris Worley
Industrial Electrician

--- John Samperi <samperi@ampertronics.com.au> wrote:
> Thanks again for more suggestions and ideas. I'm
> sorry
> I can't be more specific on the application yet but
> I
> don't really know how confidential the information
> is,
> whether it is covered by patents or pending patents
> so
> I'm trying to be generic in terms so I don't get
> into
> any possible trouble. In a week or 2 I should be
> able
> to know what I can say and what I can't.
> 
> The best analogy I can come up with is my kitchen
> oven.
> Gas flame at the bottom, temp sensor at the top,
> food
> in between and the oven door needs to be opened
> occasionally
> because the oven lamp has been broken for a couple
> of years
> an I haven't fixed because I "haven't got a round
> twit" :-[
> 
> In fact now that I think of it, all that my
> prospective client
> needs is a kitchen oven temperature controller that
> goes up to
> about 500 degrees celsius instead of the 280 that my
> oven goes
> up to....but then I'll do myself out of a possible
> job :-)
> 
>  >Relative positioning is OK as long as you can map
> flame
>  >temperature against step size (I'm assuming a
> well-regulated gas
>  >pressure and sufficient oxygen). The "current
> flame" could probably
>  >be used as a reference point against which to
> apply the delta.
> 
> That was my original idea. I may be able to get that
> info from the
> client. It would need some possible trimming every
> few seconds
> according to the readings of the temperature
> sensors.
> 
>  >Maybe add a pressure switch, ..........You may
> also want to alarm if 
> there is a supply loss.
> 
> Already existing and handled by the main PLC.
> 
>  >What about a simple potentiometer?
> 
> That was one of my early option. Someone send me a
> link to a French
> company that makes 360 degrees flat pots. The
> Absolute position sensors
> with Gray code output seems a more elegant way of
> doing it but they seem
> to be VERY expensive.
> 
>  >Hall effect rotary position sensors (also referred
> to in some circles as
>  >Hall effect pots)
> 
> Extremely interesting, especially the sensor with
> integral activator and
> spindle. Let's find out the price now...
> 
> 
> 
> 
> 
> 
> Regards
> 
> John Samperi
> 
>
******************************************************
>                          Ampertronics Pty. Ltd.
>    11 Brokenwood Place Baulkham Hills, NSW 2153
> AUSTRALIA
>           Tel. (02) 9674-6495       Fax (02)
> 9674-8745
>                 Email: samperi@ampertronics.com.au
>                   Website 
> http://www.ampertronics.com.au
> * Electronic Design   * Custom Products   * Contract
> Assembly
>
******************************************************

> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
>     AVR-Chat-unsubscribe@yahoogroups.com
> 
>  
> 
> 
>