Instrument and Thermocouple cables

Thermocouples are used to measure temperature in various applications. Pairs of conductors made of dissimilar alloys are joined together at an exposed end, which is exposed to a heat source. This generates a small change in the resistance of the material and a subsequent voltage change when a current is applied, typically measured in micro-Volts; this is known as the "Seebeck Effect." This voltage change has a non-linear relationship to the temperature of the source and it is converted into from Volts to ºC or ºF to determine the temperature at the junction.