On 11/01/2010 01:28 AM, Jon Elson wrote:
> Igor Chudov wrote:
>
>> I would like to know if there is something for Linux that could
>> control heat treating ovens, like this one.
>>
>>
> I got a "ramp and soak" temperature controller on eBay for about $50. These
> look like the typical 1/16 DIN controller units, but have additional
> programming
> features in them, so you can set multiple setpoints with programmed ramp
> times
> between them and programmed soak times at each temp. So, you get the
> program,
> the thermocouple signal conditioning and the SSR output control all in
> one box.
> You'd pay WAY more for this as a PC plug-in card, and could wait years
> to find
> one on eBay. The ramp and soak controllers come up quite frequently,
> though.
>
> Jon
Jon,
That's what I was pointing out to Igor. Those things work great,
and are relatively inexpensive on the 'Bay. Heck, the new house
thermostat I bought about 8 months ago has the PID fuzzy logic built
into it. After a learning cycle or two, the thermostat knows exactly
when to turn the heater/air conditioner on so that the house is at the
set temp by the set time. Pretty cool stuff.
Watlow controllers are one of the more used PID temp controllers
out there, and you can always find a bunch of them available on eBay.
Probably need an SSR to carry the voltage of the heat elements in that
oven though, so look for a Watlow controller that has either logic
voltage or DC voltage as it's output. You can find controllers with
built in relays, but they won't be able to handle the voltage or current
necessary for the oven that Igor is looking at.
Mark
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