thermocouple wiring

[Jay Wallace]

Rob,
You are right that it is supposed to be a special wire. However, it 
is not the resistance that is important, but the composition. If 
the extension wire is not the proper composition you will have 
added two new thermocouples (dissimiliar metal junctions where the 
extension wire connects to the thermocouple) and erroneous 
temperature readings result. This may not be a big effect if the 
junctions stay relatively cool and if you are not concerned about 
precision (+/- 20 C guesstimate?) measurements. For common 
non-noble metal thermocouples (type K, etc) the extension wire is 
just the thermocouple wire. Check Omega or others for extension 
wire for your type of thermocouple.
HTH,
Jay

  is At 08:41 PM 12/31/2001 -0800, you wrote:
>Hi all,
>
>I need to extend the wires on my EGT probe and I remember reading somewhere
>that the wire has to be a certain ohms/foot for the thermocouple to be read
>properly.  Did I just make this up in my sleep or is this real?  Can anybody
>shed some light on this for me?
>
>Happy New Year!
>-Rob
>
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