# Thermocouple conductor direct current resistance

Does a thermocouple conductor have a direct current resistance requirement?

• 1) read: en.wikipedia.org/wiki/Thermocouple and pay attention to the section: Principle of operation. 2) Note how in the drawing, a voltmeter is used. So how much current will flow? Will the resistance matter? Dec 21, 2021 at 18:41
• Depends if you're using it just to sense temperature or to actually generate power (as in e.g. to power a failsafe gas valve) Dec 21, 2021 at 19:33

Some simple electromechanical pyrometers have a meter movement coupled directly to the thermocouple, in which case there will be a specified resistance for accuracy (for example, 10$$\\Omega\$$, typically marked on the meter scale). Such devices have become more rare as the cost of electronic solutions drops but they can still be found.