Hi Sid,
Thanks for your idea. Saves me a lot off money. Did you use shielded copper 
wire?

Stef  

> Op 25 februari 2018 om 18:47 schreef Sid Wood via KRnet 
> <krnet@list.krnet.org>:
> 
> 
> The Type K Thermocouple is a low voltage system; typically a few millivolts. 
> That's okay because the receiving electronic units are designed for that low 
> voltage.  When you need an extension for the thermocouple leads, you can use 
> copper wire quite satisfactorily.  You must keep the thermocouple leads as 
> close to the same length as possible so that the voltages from each 
> thermocouple will be the tracking the same.  The voltage is generated by the 
> junction, not the wires by themselves.  The Iron and Constantan does have 
> more resistance than copper, so the need for matching the lengths.  The Iron 
> wire and Constantan wire is much harder than copper wire; copper style crimp 
> connectors will not reliably stay attached to the thermocouple wires.  You 
> need to use screw type terminal barrier strips for each connection and put a 
> lock washer under the head of each screw to maintain pressure on the bare 
> thermocouple wire.  The copper extension wires can be any convenient length; 
> the copper wires do not need to be matched in length.  Copper crimp lugs 
> will work fine for the copper wire.
> This copper wire extension has worked quite well for the EGT and CHT sensors 
> in my KR-2.
> 
> Sid Wood
> Tri-gear KR-2 N6242
> California, MD, USA
> 
> ----------------------------------------------------------------------
> I have received with my garmin set theromcouples for the EGT. Alcor inc p/n 
> 86255. I need an extention for both sensors. I already bought type K 
> thermocouples for the CHT via ebay (4?) with a big overlengt. Can I use this 
> wire to extend the alcor type or do I have to buy the same brand for to much 
> money?
> 
> stef
> 
> 
> 
> 
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Steph and his dad are building the KR-2S see http://www.masttotaalconcept.nl/kr2

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