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Old 08-25-2019, 12:02 PM
Eben Horton Eben Horton is offline
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R thermocouple rebuilder

Who should I have rebuild one of my thermocouples ? I have never rebuild mine and itís going on 20 years of fairly flawless performance, but I think itís time.
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Old 08-25-2019, 12:24 PM
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Pete VanderLaan Pete VanderLaan is offline
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There's no real life issue there Eben. I have some type "R"'s with 40 plus years on them. They need the outer sheath replaced regularly but that's it. Get a thermocouple tube from Omega or the supplier of your choice and some fine furnace mortar. The older ones had a heavier gauge wire back when platinum was not so expensive. They have real staying power.

If you insist, I think Grant/Edgell in Portland would do it.
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Old 08-25-2019, 01:09 PM
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Run it 'til the wheels fall off!
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Old 08-25-2019, 06:12 PM
Eben Horton Eben Horton is offline
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Thanks for your input guys.
I should clarify a little bit. I have been having continuity troubles with mine. A couple of months ago it sent a false signal to my controller and sent it to 2400 degrees. By simply loosening one of the connections and re tightening it, it corrected itself. Iím unsure of how to correct this problem from happening again
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Old 08-26-2019, 06:38 AM
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clean the ends of the wire. Re install. Otherwise, you're just paying someone to change out the wire which will cost as much as wire runs in current markets. Clean those connecting screws too.
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Old 08-26-2019, 10:27 AM
Eric Trulson Eric Trulson is offline
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Yeah, as long as the hot-end weld isn't broken, there isn't really much you can do for the thermocouple wire itself except to replace it.

From the sounds of that continuity issue a few months ago, I'd look for any corrosion on the cold end connection - check out the bare TC wire ends and the terminal block they go into and give them all a good cleaning.

For cleaning, I'd take the set screws entirely out of the terminal block if possible. Give the set screws, the terminal block, and the bare wire ends of the TC a nice long soak in your meanest solvent, and then use a light abrasive to return the wire ends, set screw faces, and interior faces of the terminal block to bare unoxidized metal before reassembling.

(Also, 20 years? 40 years?! Impressive lifespans on these things)
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Old 08-26-2019, 10:58 AM
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40 years? think of gold in a shipwreck. It doesn't decompose. Everything around it does.
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Old 08-26-2019, 03:17 PM
Eben Horton Eben Horton is offline
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Hey Eric, thanks for that tip. I did that after the problem Happened. I also clipped back a few inches of wire and crimped on nice new prong connectors and even went as far as using heat shrink tubing over the back of the connectors to keep out the nasties.
Maybe I will just cross my fingers and hope it doesnít happen again.
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Old 08-26-2019, 03:58 PM
Charles Friedman Charles Friedman is offline
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Depending on where the TC connection is located. Shrink-tube may not be the way to go. Use Hight Temp 3M tape.
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Old 08-29-2019, 12:59 PM
Eben Horton Eben Horton is offline
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Ok. I am back to report that I failed the IQ test with this problem. The thermocoupleís terminal bus is designed for a wire to be inserted into a hole and a set screw goes down an crushed the wire between the screw and the bottom side of the hole. When I made prong connectors and attached them underneath the heads of the screws, it didnít occur to me that the screws are too long for the terminal to be squeezed under neath the head. What was happening was I was just tightening the screws into the bottom of the terminal block.

I removed my prong connectors and now have bare wire in the holes and all is well.
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Old 08-29-2019, 02:10 PM
Rick Kellner Rick Kellner is offline
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Doh! Well, it must be a relief that the issue is finally sorted out.
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Old 08-29-2019, 04:29 PM
Eben Horton Eben Horton is offline
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Quote:
Originally Posted by Rick Kellner View Post
Doh! Well, it must be a relief that the issue is finally sorted out.
Yes. A relief. And since I have a pretty low ego I donít mind sharing this little learning lesson. Hopefully it will help someone.
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Old 08-29-2019, 05:32 PM
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Pete VanderLaan Pete VanderLaan is offline
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There are times when craftweb should be looked at as institutional knowledge over the decades. .

It's irreplacable actually.
It's why it's so scary that the current administration is trying actively to dismante that in both the USDA and the BLM. People's brains are an incredible repository.


I mean, chocolate cigarettes?
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Old 08-30-2019, 06:36 PM
Charles Friedman Charles Friedman is offline
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Quote:
Originally Posted by Eben Horton View Post
Okit didnít occur to me that the screws are too long for the terminal to be squeezed under neath the head. What was happening was I was just tightening the screws into the bottom of the terminal block.

I removed my prong connectors and now have bare wire in the holes and all is well.
Sometimes when the little wires are so small, I will add an extra loop of wire, just too bulk-up and get more of a mass touching itself, a much better connection.
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Old 08-31-2019, 07:36 AM
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I had a platinum wire break in one years ago and like the tarot card of the fool, I tried to weld it back together- which worked. Looking back at that I have no idea of why it worked or what I did to get it to work.

The whole principle of the fool card is that the fool is walking off a cliff playing his flute. However the understanding is that he will turn away from the edge at the very last moment never realizing the danger he was in and just keep on playing.
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Old 08-31-2019, 07:54 AM
Eben Horton Eben Horton is offline
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Is there a card for the self reliant artist ?
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Old 08-31-2019, 08:03 AM
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No, these deal in reality.

I see where the thread is hijacked at this point The sloop of information will go down in the shallows of the harbor but it appears it did its job.
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Old 09-03-2019, 07:36 AM
Brendan Miller Brendan Miller is offline
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If it works it works. Replace housing and sheath as needed. When it stops working, Cleveland Electrical Instruments can assess if it can be repaired. If it's toast they will salvage the platinum that can be applied to the replacement. Just got one done from them. Very easy.
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