Thermocouple wiring

Robert Erickson

Robert Erickson

Knifemaker / Craftsman / Service Provider
Joined
Feb 2, 2014
Messages
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I've got an Evenheat oven that I'd like to double check the temps on. I've used Tempil paint but would like to have a thermocouple wired up to be able to double check the one that the oven came with. I'm not planning to permanently fixing it to the oven. I was planning on drilling a hole in the door to occasionally double check the temp inside. I'll fill the hole with kao wool when the probe isn't inserted.
I have an Auber instruments K Type thermocouple and Auber PID. I know where to hook up the thermocouple, my question is regarding power. I just want it to display the temp and not control anything, do I just hook up a power cord to the PID or do I need an SSR or anything else to get it to read the temp?
 
Robert
Generally specking, You will have to go into set up mode to set the thermocouple type, unless itype "K" is the default "as shipped type". Hook up the power cord and the thermocouple wires (type K yellow wire is positive) then plug it in.
The run mode is usually default. You can check the documentation that came with the unit if you need to put it in the run mode.
If this doesn't work, post the modle number of the unit so I can get a copy of the operating instructions, and I'll help walk younthrouh the process.
Jim A.
 
DAMNENG said:
Robert
Generally specking, You will have to go into set up mode to set the thermocouple type, unless itype "K" is the default "as shipped type". Hook up the power cord and the thermocouple wires (type K yellow wire is positive) then plug it in.
The run mode is usually default. You can check the documentation that came with the unit if you need to put it in the run mode.
If this doesn't work, post the modle number of the unit so I can get a copy of the operating instructions, and I'll help walk younthrouh the process.
Jim A.
Click to expand...
Will do thanks!
 
And, you need to use the right TC wire. Regular wire will give wrong readings. You will need type K wire for a kiln. It is polarized, so hook it up as directed to the TC and PID. 20 gauge is a good size. If you can't get some, let me know. I'll send you a few feet.
 
Jim I have it wired for power now and it seems to be working fine. It reads the ambient temp accurately and increases when I hold the TC tip. However the model number is SYL 1512AR in case you can shed any light on whether it defaults to the correct settings.
Thanks for the offer Stacy, the TC came with it's own wire so I think I'm ok in that department.
 
Robert
I downloaded the manual. At the top of page 2, right hand side, just below table 1, Note 1 says controller is preset for K type thermocouple.
Jim A.
PS If you want to confirm you have it correct, bring a cup of water to a boil (micro-wave works well for this, then stick the end of the probe in the water. If it reads 100°C or 212°f your good to go.
 
Last edited:
DAMNENG said:
Robert
I downloaded the manual. At the top of page 2, right hand side, just below table 1, Note 1 says controller is preset for K type thermocouple.
Jim A.
PS If you want to confirm you have it correct, bring a cup of water to a boil (micro-wave works well for this, then stick the end of the probe in the water. If it reads 100°C or 212°f your good to go.
Click to expand...
Thanks again Jim!
 
Unless the thermocouples are almost touching, you can expect a 5 to 15 degree difference between the thermocouples. I don't think this is enough to effect your heat treat.
I was worried about temperature accuracy with my first kiln, so I used 3 thermocouples with different displays. When the difference between the 3 was 10 degrees at 1500F, I figured every would be ok.
scott
 
People freak out about a 5-15 degree variance between two TC readings. At HT temp, that is a .3% to 1% error. It is the equivalent of getting a 99 one every test … that was considered very good when I went to school.

I won't get started about some peoples HT regimes where they state - austenitize ate 1473.8 for 15 minutes …….
 
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