Quote from Raggedyman on July 20, 2024, 1:32 pmSo, I finally started building, and soon realised that I have an issue - I have no idea at what height or how deep the thermocouple should be...
How much of it should stick out into the inside of the furnace, about half an inch? likewise how high up on the furnace wall should I put it in? I assume putting it near the bottom will give me a higher temp reading as it's closer to the tuyere, and we need an average of the inside, so about halfway up?
Lastly how do you get it into the furnace wall? just drill a hole exactly the same size, or cover the thermocouple with a thin coat of petroleum jelly (so it can come out) and have it in when casting the wall so the wall forms around it?
How did you guys do yours?
So, I finally started building, and soon realised that I have an issue - I have no idea at what height or how deep the thermocouple should be...
How much of it should stick out into the inside of the furnace, about half an inch? likewise how high up on the furnace wall should I put it in? I assume putting it near the bottom will give me a higher temp reading as it's closer to the tuyere, and we need an average of the inside, so about halfway up?
Lastly how do you get it into the furnace wall? just drill a hole exactly the same size, or cover the thermocouple with a thin coat of petroleum jelly (so it can come out) and have it in when casting the wall so the wall forms around it?
How did you guys do yours?
Quote from Raggedyman on July 22, 2024, 1:31 amNever mind, found an answer:
- Height - at the top of the crucible
- depth - just peeking out
I figure I'll just whittle a dowel to the same size as the thermocouple and cast that in, then burn it out.
Never mind, found an answer:
- Height - at the top of the crucible
- depth - just peeking out
I figure I'll just whittle a dowel to the same size as the thermocouple and cast that in, then burn it out.
Quote from Jacob Christian on July 22, 2024, 8:10 am@raggedyman
I put my thermocouple just about in the middle of my crucible. It really does not matter too much where you put the thermocouple if you are hitting 1550C anyway.
That being said, I put my TC in the middle of the crucible as that is the spot where most of the metal is. I also have a second TC that touches the bottom of the crucible, coming up from the bottom and through the plinth.
And yes just peaking out is perfect.
I put my thermocouple just about in the middle of my crucible. It really does not matter too much where you put the thermocouple if you are hitting 1550C anyway.
That being said, I put my TC in the middle of the crucible as that is the spot where most of the metal is. I also have a second TC that touches the bottom of the crucible, coming up from the bottom and through the plinth.
And yes just peaking out is perfect.
Quote from Jacob Christian on July 22, 2024, 8:14 amQuote from Raggedyman on July 20, 2024, 1:32 pmSo, I finally started building, and soon realised that I have an issue - I have no idea at what height or how deep the thermocouple should be...
How much of it should stick out into the inside of the furnace, about half an inch? likewise how high up on the furnace wall should I put it in? I assume putting it near the bottom will give me a higher temp reading as it's closer to the tuyere, and we need an average of the inside, so about halfway up?
Lastly how do you get it into the furnace wall? just drill a hole exactly the same size, or cover the thermocouple with a thin coat of petroleum jelly (so it can come out) and have it in when casting the wall so the wall forms around it?
How did you guys do yours?
Getting it into the furnace. I poured the wall solid and then after the refractory set up a bit, maybe a day later, I just drilled it in with the closest size drill bit.. The stuff is still super soft until it fully cures.
Quote from Raggedyman on July 20, 2024, 1:32 pmSo, I finally started building, and soon realised that I have an issue - I have no idea at what height or how deep the thermocouple should be...
How much of it should stick out into the inside of the furnace, about half an inch? likewise how high up on the furnace wall should I put it in? I assume putting it near the bottom will give me a higher temp reading as it's closer to the tuyere, and we need an average of the inside, so about halfway up?
Lastly how do you get it into the furnace wall? just drill a hole exactly the same size, or cover the thermocouple with a thin coat of petroleum jelly (so it can come out) and have it in when casting the wall so the wall forms around it?
How did you guys do yours?
Getting it into the furnace. I poured the wall solid and then after the refractory set up a bit, maybe a day later, I just drilled it in with the closest size drill bit.. The stuff is still super soft until it fully cures.