A post thermocouples What place?

Small Engines Charcoal Gasification
#1

I want to know my temperature reactor “coal” for the controler.
Where to place the thermocouple without risking the burn?
If I is housed near the thermocouple “more or less” the nozzel.
Are there a trick to interpret the temperature?
Thierry

#2

On the gasifier itself, I have placed one 1" above the grate. That is a very harsh environment (2000±F) They don’t last long. The next best place is the 8" cross over pipe. (500-1200F) Easy to access, fast response time, and a good indicator of what is going on in the reduction zone. A good drop box heat exchanger will drop 300-400 deg F so you can also monitor gas temp into the cooling rails as Wayne does. Nozzle temps don’t give much useful information about the gasifier operation in the oxidation -reduction zones.

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#3

Carl thank you
My gasifier is coal.
The best place for thermocouples it the same?
Thierry

#5

Mr T.T.'s gasifier is a charcoal gasifier.
Maybe AdminChris could add this to his topic title so he could get charcoal systems users advice.
Regards
Steve Unruh

#6

Thank you very generous day from you Richard
Excellent proposal steve
Thierry

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#7

Use type K thermocouple. 1mV = 25 degrees C

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#8

Ok John.
You do not calibrate your thermocouple in degrees?
You simply measure the voltage change?

Thierry

#9

Place thermocouple wherever you wish to know the temperature.
No problem.

#10

Yes. I use several thermocouples in my system. I read them all with a multimeter. (Switching from one to another with a rotary switch) I really don’t bother to calculate the temperature but I know the formula, one millivolt equals 25°C. So when I am running I simply think in terms of millivolts. It’s quite simple.

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#11

Regarding burning up the thermocouple, the thermocouple on my grate is protected inside a small stainless steel tube. No problem. I have not tried a thermocouple near a nozzle, But if I did I would insert it into a stainless or perhaps a ceramic tube and then see what happens.

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#12

Hi John

Thank you for your valuable advise.
J 'love the idea of the thermocouple in a pipe

Thierry