REFLECTOR: Thermocouple wire size???

Scott Derrick scott at tnstaafl.net
Thu Jul 20 20:50:44 CDT 2006


I'm connecting standard Type K & J thermocouples, bayonet type to a 
Vision Micro EIS.

Scott

michalk wrote:
> It matters what the thermocouple is connected to.
> On my Westach gauge, it specifies the resistance of the thermocouple. 
> Since the gauge is essentially a very sensitive current meter, the 
> resistance of the thermocouple is important.
>
> If connecting to a thermocouple amplifier, such as the AD594/AD595, 
> which is a glorified op-amp, then it's a voltage device, and the 
> thermocouple resistance doesn't matter.
>
> Thermocouple wire is very high resistance per foot.  Depending on the 
> type, it's around 1 ohm per foot for the 24 gauge wire, as far as I 
> recall.  I have the numbers around somewhere.  I use thermocouple wire 
> in my circuits when I need a good low ohm resistor, simply trim to the 
> correct resistance.
>
> Scott Derrick wrote:
>   
>> anybody know what wire size(gauge) I need?  for thermocouple wire? 
>>
>> stranded better than solid?
>>
>> Scott
>>
>>     
>
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