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jpoint(at)wi.rr.com
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 Posted: Tue Apr 04, 2017 7:45 pm Post subject: MGL CHT probe |
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I recently purchased the MGL 18mm spark plug CHT probes from Aircraft Spruce. The photo on both their website and MGL's shows a copper ring soldered to a K-type thermocouple wire, a pretty standard setup. What they sent me is pictured below. Since the bare wire ends connect directly to the RDAC brain box, I deduced that the other end- a 1/4 PIDG fast-on, crimped to the thermocouple wires- must just attach to the copper ring. The tab end of the copper ring is exactly 1/4 inch, so this makes sense.
This seems like a pretty cheeseball setup. From what I know of K-type thermocouples (mostly from reading the 'Connection) that wires must be silver soldered to the probe and to each other. Or, am I mistaken and is this a reasonable setup?
I am also reaching out to MGL about this, but I thought I'd ping this group for your thoughts as well.
Thanks
Jeff Point
Milwaukee
[img]cid:part1.6A37B435.25B20261(at)wi.rr.com[/img]
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kjashton(at)vnet.net
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| Posted: Wed Apr 05, 2017 3:37 am Post subject: MGL CHT probe |
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| Quote: | | On Apr 4, 2017, at 11:42 PM, Jeff Point <jpoint(at)wi.rr.com (jpoint(at)wi.rr.com)> wrote:This seems like a pretty cheeseball setup. From what I know of K-type thermocouples (mostly from reading the 'Connection) that wires must be silver soldered to the probe and to each other. Or, am I mistaken and is this a reasonable setup? |
What you have will probably work just fine but yes, the high dollar thermocouples usually silver-solder the wires to the copper ring and incorporate a support (pic), however they’re amazingly expensive.
Silver-soldering is a good skill to learn and does not take much more than a propane torch and the proper materials. Here are a couple I made as an experiment (2nd pic). They use copper sparkplug gaskets and a piece of stainless welding wire as the support. A “resist” is a material applied to the parts that you don’t want the solder to flow onto. Wite-out makes a pretty good resist. The tricky part is jigging the parts while you heat them. This place has all the supplies and there are many Youtube videos.
https://contenti.com
Time or money, take your choice. 
-Kent
[img]cid:3249BA92-0C21-4B0A-B18E-CC3BBDAA0951[/img][img]cid:63847E6A-409C-49BE-AFD0-E5BE3A5A5DCD[/img]
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