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philperry9
Joined: 23 Nov 2011
Posts: 381
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 Posted: Wed Aug 19, 2015 5:29 am Post subject: Thermocouple Questions... |
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Hello,
Last night I started connecting my Type-K sensors up to the airplane instrumentation.  Trimming the single conductor leads from the instrumentation to match the length of the leads on the thermocouple.  Then in the process of crimping a wire I managed to cut one of the leads when it got pinched unknowingly in the backside of the crimpers. Ooops....
So my problem now is that my wires between my instrumentation and the the connections on my thermocouple are too short. Thus I need to extend them.
The thermocouples I'm installing now are EGT and CHT sensors from Alcor. Â (With a ring connectors).
Questions:
1) The sensors have ring connectors already installed. Â I don't have the other ring connectors (matching metal) for them to join to. Â Where can I buy these to crimp on or can I simply use my PIDG connectors?
2) I'm assuming that if I use the correct metal the impact to reading would be very minor?
3) I'm also assuming that these connectors are very expensive. Yes? No? Is there are cheaper way to join them?
4) Finally, I've managed to lose a couple of the fiberglass sleeves. Where can I buy those and is there a reason I can't just cover the connections in heat shrink?
Thanks for your comments,
Phil
[quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Wed Aug 19, 2015 6:06 am Post subject: Thermocouple Questions... |
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At 08:27 AM 8/19/2015, you wrote:
| Quote: | Hello,
Last night I started connecting my Type-K sensors up to the airplane instrumentation.  Trimming the single conductor leads from the instrumentation to match the length of the leads on the thermocouple.  Then in the process of crimping a wire I managed to cut one of the leads when it got pinched unknowingly in the backside of the crimpers. Ooops....
So my problem now is that my wires between my instrumentation and the the connections on my thermocouple are too short. Thus I need to extend them.
The thermocouples I'm installing now are EGT and CHT sensors from Alcor. Â (With a ring connectors).
Questions:
1) The sensors have ring connectors already installed. Â I don't have the other ring connectors (matching metal) for them to join to. Â Where can I buy these to crimp on or can I simply use my PIDG connectors? |
For a short extension, where BOTH ends of the
extension wire are in the same environmental
temperature, you can use ordinary copper wire.
The parasitic junctions added by the foreign
alloy will cancel out each others effects.
Use pidg splices to extend the damaged wire with
copper . . .
Use pidg terminals to mate with wires extending
into the cockpit . . .
Plain vanilla heat-shrink is fine.
Bob . . . [quote][b]
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recapen(at)earthlink.net
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| Posted: Wed Aug 19, 2015 6:16 am Post subject: Thermocouple Questions... |
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Phil,
My experiences.....
I have used male/female spade connectors with heat-shrink sleeves. I soldered my connections as well since the wire used does nor have sufficient elasticity to create a physical/sealed connection. I used the same connections - and ordered spares from my equipment supplier - they should be able to tell you what they use and source.
Metal to metal differences cancel out generally as long as both sides of the connection are in the same side of the firewall.
The type (cost) of connector is not really important - consistency and vibration-free physical connection is important.
I cover mine with heat-shrink to reduce the vibration potential.
Ralph
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Wed Aug 19, 2015 6:39 am Post subject: Re: Thermocouple Questions... |
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For further reading:
http://www.aeroelectric.com/articles/excerpt.pdf
http://www.mglavionics.com/CHT_Parallel_Splice.pdf
Whatever gets done to one thermocouple wire should also be done to the other wire, and in the same physical location. In other words, if one of a pair of thermocouple wires is spliced inside of the engine compartment, then its mate should also be spliced in that same location. The two splices should be at equal ambient temperatures.
Joe
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email(at)jaredyates.com
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| Posted: Wed Aug 19, 2015 7:03 am Post subject: Thermocouple Questions... |
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I had trouble getting a good connection with crimp-on terminals, so I tried Omega connectors. Here are the details:
http://bearhawkblue.com/replacing-the-oem-dynon-thermocouple-connectors-with-omega-connectors/
All of my intermittent readings went away when I switched to these.
[quote] On Aug 19, 2015, at 10:15, Ralph E. Capen <recapen(at)earthlink.net> wrote:
Phil,
My experiences.....
I have used male/female spade connectors with heat-shrink sleeves. I soldered my connections as well since the wire used does nor have sufficient elasticity to create a physical/sealed connection. I used the same connections - and ordered spares from my equipment supplier - they should be able to tell you what they use and source.
Metal to metal differences cancel out generally as long as both sides of the connection are in the same side of the firewall.
The type (cost) of connector is not really important - consistency and vibration-free physical connection is important.
I cover mine with heat-shrink to reduce the vibration potential.
Ralph
--
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recapen(at)earthlink.net
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| Posted: Wed Aug 19, 2015 8:08 am Post subject: Thermocouple Questions... |
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Good info - thanks!
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