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You must use thermocouple wire (of the same type as the thermocouple) to extend the circuit. If you switch to a different wire the point of connection between the two becomes a thermocouple junction itself, and the resulting voltage from that junction will skew your reading.

You can use any wire to extend a thermocouple connection if you know the temperature of the junction where the thermocouple wire ends--this becomes the reference junction.

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12y ago
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faiyaz461

Lvl 1
3y ago
"You can use any wire--- if you know the temperature of the junction" ?? How come the knowledge of the junction temperature creates freedom to use any wire???  -- it must be explained how this knowledge of junction temperature would be used. 

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Q: Do you need to use TC extension wire to connect a thermocouple or can you use shielded cable?
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