Question about Dyna-Glo D-E37 Wall Mounted Panel Heater

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Thermocouple how many millivolts should a thermocouple in a pilot flame be?

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I am assuming you are talking about a type K ( Chromel, Alumel ) type Thermocouple. A junction of these two alloys ( welded together by capacitance discharge) produces 41 micro volts per degree Celsius. As the flame from a perfect air/gas mix produces a flame around 1900 C (propane), and 2000 C (natural gas) . You can simply multiply.

41uV X 1900 = 779mV For propane
41uV X 2000 = 822mV For natural gas

This should give you a pretty good Idea of what you should be looking for. If you are using a standard volt meter to obtain a reading. Touching the leads of the probe to the leads of the meter in affect creates two more thermocouples unintentionally. This will alter your reading only slightly due to the fact that the temperature will be at relatively negligible at the contact points.
Allowing for this distortion you should expect a reading +/- 50mV either way. I hope you find this information helpful. Please take the time to rate this fixya for me. To compensate me for the 4 years of my life I spent cramming weird stuff like this in my head in college and the 5 minutes I spent typing this out for you for free. LOL If you ever need my help select me as one of your experts and I will help you for free.

Posted on Jul 28, 2008

  • George Kohler
    George Kohler Jul 28, 2008

    If you give me the exact type thermocouple you are working with and what gas the heater uses, I will calculate the exact reading you should be reading. I think the above estimates should be accurate enough for your purpose though.
    Thanks Again,



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1 Answer

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