High temperature control circuit

Discussion in 'The Projects Forum' started by jeff52, Jul 10, 2011.

  1. jeff52

    Thread Starter New Member

    Jul 8, 2011
    4
    0
    Hi all, does any one have a simple schematic with values of components for a high temperature control circuit, say around 2600 degrees F? I am building a kiln for melting metal and need to accurately control temperature to activate and deactivate a relay connected to a gas valve. :)
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    It's not going to be simple, as most thermocouples either won't go that high, or that is their absolute limit.

    Also, it sounds like you are planning on using either natural gas or other type of flammable gas in a kiln.

    There are definite safety hazards involved in such a project, and as such it would have to be made fail-safe.

    I don't believe that we can design such a thing via here, as the Terms of Service prohibit discussion on projects that may result in property damage or injuries/death - and a gas explosion would certainly be capable of causing either/both/all of those things.
     
  3. jeff52

    Thread Starter New Member

    Jul 8, 2011
    4
    0
    Well I guess I could go electric, did not want to use LP much anyway, I have not built the fire brick layout yet so it would be easy to go with flexible heating elements [like a heat strip], high heat wire and two contactors [if one contactor were to stick in closed position the other would still open so as not to cause a runaway condition in temperature]. Also would need a electronic high limit. I was wondering if there was some type of IR sensor to sense temp instead of a T couple, if not then the max temp would be 2300 degrees F. I think this would be relatively safe, what do you think, I can also get heating elements from a kiln manufacturer. I need to build all else myself though to save money, thanks.
     
  4. Jaguarjoe

    Active Member

    Apr 7, 2010
    770
    90
    Steel mills routinely measure 2000-3000 degree temps day in and day out. Leeco made sacrificial probes for measuring BOP heat temperatures, 2900-3000 +/- a few degrees. IR sensors read plate and finish temps in the rolling mill and T/C's read slab temperatures in the slab reheaters.
     
  5. jeff52

    Thread Starter New Member

    Jul 8, 2011
    4
    0
    So, back to my original question, does any one have a schematic with values of components for a high temperature control circuit, to control an electric kiln?:)
     
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