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High temperature epoxy for ungrounded thermocouple probe

 
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jmfpublic(at)comcast.net
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PostPosted: Sat Feb 11, 2006 4:51 pm    Post subject: High temperature epoxy for ungrounded thermocouple probe Reply with quote

Listers:

I have a Jabiru 3300 6 cylinder engine that uses spark plugs with a thread diameter of 0.645 inches. I wish to use ring terminals of 3/8 inch diameter drilled out to 15/32=3D0.4688 inches. (Using a Unibit will allow a clean cut.) This will center the probe more accurately than some commercial probes, and it allows me to make my thermocouples using type J wire that I bought from Omega. I don't want any splices, and will custom fit each wire, with an appropriate service loop.

My question is this. I wish to insulate the 1/4 inch or less soldered end of the thermocouple. Should I use a bit of tefzel insulation, or plumbing Teflon tape? Is there a thin ceramic that is used that I never heard of? The main question is what sort of potting compound to use. I haven't researched high temperature epoxy yet, and would appreciate any suggestions. I am using a thermocouple amplifier, and a grounded thermocouple will not work well at all.

Jim Foerster, J400, wiring


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