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'[EE] Thermocouple'
2007\01\29@202429 by Dave King

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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

2007\01\30@043336 by Vasile Surducan

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I'll go for a K one. The problem there is aging in a continuous flame
with oxidation atmosfere available.

Vasile

On 1/30/07, Dave King <spam_OUTKingDWSTakeThisOuTspamshaw.ca> wrote:
{Quote hidden}

> -

2007\01\30@152041 by Al Shinn

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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"


2007\01\31@071052 by Dave King

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I played around with the honeywell brand one I grabbed and it showed
~18mv in a candle flame which is supposed to be about 1400F at its
coldest point. Extrapolating up to 30mv rating that gets about 2300F
which is about what a chromal-copel type is rated at 30mv.

These thermocouples are maybe 3/16 dia at most. Quite small.
If these worked for 300-400 hours I would be quite happy with
them.

Still would like to know what these are for sure but Honeywell
only shows a Euro model (Q390) which is rated at 1400.

Dave


{Original Message removed}

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