If you mean the sort of thermocouple used in heaters and etc, then the 
site below implies that the temp of the couple is between 400 and 650 
deg F  (in its intended usage) with lifetime reducing by 50% for each 
increase of 100 Deg

http://www.hvacwebtech.com/thermocouple.htm



These sort of thermocouple are probably not the best for temperature 
measurement since the whole thing is fat and the hot end is close to the 
cold end and all you measure is the difference. The couple is not at the 
flame temp because of conduction away from the hot zone.

If on the other hand, the couples you found are just longish wires 
welded at the joining tip, Then you still need to know the other wire 
material to find the service temperature.
Copel is copper-nickel alloy, whereas type J is copper-nickel / iron 
pair good to >1300F as you say

By the way the direct answer is - ~3500 deg F flame temp.
-- 

Looking forward,
Al Shinn

"Just wondering if anyone knows what the temperatures are
in the flames/pilot lights of gas appliances. Gas water
heaters or furnaces.

I found some Honeywell thermocouples that are quite cheap
but I'm not quite sure if they have the correct temp range
to be useable. The material shown for these is a "Copel"
type material which appears to cross over to a type J or
about 1370 degrees farenheight continuous. If this is valid
I can use these to play with.

Anyone know?

Dave"


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