This is the actual "Flame Temperature." Remember that a measuring device (thermocouple) may also remove heat from the flame. How? What effect does this have on your data?

Light the pilot and hold down the gas valve. Release it after 30 seconds. If the flame dies instantly, the thermocouple likely needs attention." This way you can eliminate the chance that drafts ...

If the flame doesn’t stay lit or needs to be manually relit often, Siv says this indicates a mechanical problem with the thermocouple or gas valve. “It’s best to call in a pro at that point ...

This thermocouple is a safety device which stops the gas flux in case the flame goes out, avoiding a possible gas saturation of the room.