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Your thoughts on ideal stack temperatures

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by Diabel, Nov 12, 2008.

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  1. 3fordasho

    3fordasho Feeling the Heat

    Joined:
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    Loc:
    South Central Minnesota

    I have double wall from the stove to the class A insulated so I don't think my external (surface) thermometer will read correctly, plus my straight sections are telescoping (adjustable) sections so in reality they are more than double wall. I am curious though as my temp readings seem lower than everyone elses. When I get a chance I'll try an industrial digital readout temp controller I have laying around, it has an external j-type thermocouple I could stick into the flue easy enough.

    And just for clarification, the internal flue is reading 200-250F with the fireview loaded, cat engaged, air inlet between 3/4-1, and reaching stove top temps of 400-525F.

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  2. 3fordasho

    3fordasho Feeling the Heat

    Joined:
    Jul 20, 2007
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    Loc:
    South Central Minnesota

    Just checked flue temps- tel-tru was reading 230f. unscrewed it and placed in a j-type thermocouple connected to a omron temp controller. It reads a good 100f higher. So much for the accuracy of the tel-tru or could it be the ONE time l left the air wide open for too long and the guage was pegged at 1000F... doh

    At least I can stop worrying about burning too cool and having a creosote factory.
  3. Todd

    Todd Minister of Fire

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    Don't feel bad, my Condar probe was way off last year. It was never the same after it got too hot, It was way off and by the time I threw it away the thing would just continue to climb in temp til it pegged out. I don't know if I'll ever trust an internal anymore, I'm sticking to the external one now.
  4. bsa0021

    bsa0021 Feeling the Heat

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    Ohio
    Just checked flue temps- tel-tru was reading 230f. unscrewed it and placed in a j-type thermocouple connected to a omron temp controller. It reads a good 100f higher. So much for the accuracy of the tel-tru or could it be the ONE time l left the air wide open for too long and the guage was pegged at 1000F... doh

    At least I can stop worrying about burning too cool and having a creosote factory.[/quote]




    3fordasho: You have to watch those Tel-tru thermometers. They are adjustable and the tolerance (stiffness)for adjustment is pretty loose. I prefer a different brand (I think hamilton) but you still have to be carefull not to turn the head. I finally spent the money at work for digitals to keep me out of hot water...don't ask.
    Best way to calibrate and required in (food processing) any thermometer is with a certified mercury thermometer. Bob
  5. 3fordasho

    3fordasho Feeling the Heat

    Joined:
    Jul 20, 2007
    Messages:
    470
    Loc:
    South Central Minnesota



    3fordasho: You have to watch those Tel-tru thermometers. They are adjustable and the tolerance (stiffness)for adjustment is pretty loose. I prefer a different brand (I think hamilton) but you still have to be carefull not to turn the head. I finally spent the money at work for digitals to keep me out of hot water...don't ask.
    Best way to calibrate and required in (food processing) any thermometer is with a certified mercury thermometer. Bob[/quote]



    Thanks for the info, I know certain models are adjustable (have a set screw that you loosen to adjust) but mine does not have the set screw. I am guilty of threading it in and out using the head instead of the hex nut so perhaps I have caused my own problems? If in fact the head has moved in relation to the needle, I will try to recalibrate it.
  6. bsa0021

    bsa0021 Feeling the Heat

    Joined:
    Oct 1, 2008
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    405
    Loc:
    Ohio


    Thanks for the info, I know certain models are adjustable (have a set screw that you loosen to adjust) but mine does not have the set screw. I am guilty of threading it in and out using the head instead of the hex nut so perhaps I have caused my own problems? If in fact the head has moved in relation to the needle, I will try to recalibrate it.[/quote]

    The hex nut is the adjuster. Hold the nut w/pliers and turn the head to match a mercury thermometer (or good known source) immersed in water.
  7. M1sterM

    M1sterM Member

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    Aug 21, 2008
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    Northcountry
    It's rated to tolerate up to 2100 degrees on 3 seperate occasions (e.g. after 3 chimney fires, time to replace it). It's only rated to 1000 on a continuous basis.
  8. Wrigley

    Wrigley New Member

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    Berkshires
    Thanks for the clarification -- with my old Morso 1125 I try to burn a bit on the hot side to minimize creosote and smoke, with stack temps around 500 early in the burn cycle. So that should still be alright for continuous use ....
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