Noun
thermocouple (plural thermocouples)
(physics) A transducer consisting of two different metals welded together at each end; a voltage is produced that is proportional to the difference in temperature between the two junctions (one of which is normally held at a known temperature)
A continuous transfer of heat is necessary because the current flowing through the thermocouple tends to cause the hot side to cool down and the cold side to heat up (the Peltier effect ). Source: Internet
Although current flows very little, power can be generated by a single thermocouple junction. Source: Internet
A thermocouple or Resistance Temperature Detector (RTD) can then be used to measure the temperature of the filament. Source: Internet
A thermocouple or resistance thermometer (RTD) can then be used to measure the temperature of the filament. Source: Internet
A useful feature in thermocouple instrumentation will simultaneously measure resistance and detect faulty connections in the wiring or at thermocouple junctions. Source: Internet
Apart from testing the open circuit voltage of the thermocouple, and the near short-circuit DC continuity through the thermocouple gas valve coil, the easiest non-specialist test is substitution of a known good gas valve. Source: Internet