The exploration of “Thermocouple and its Principle,” sourced from, sheds light on the fundamental principles of thermocouples.

Principles of Thermocouples:

A thermocouple comprises two dissimilar metal pieces joined at their ends, typically through twisting, soldering, or welding. When subjected to heat at the junction, a voltage in the millivolt range is generated, making the thermocouple self-powered.

The voltage produced at each junction is temperature-dependent. If one junction’s temperature (T1) surpasses the other (T2), the voltage at Junction 1 will exceed that at Junction 2. This voltage disparity determines the loop current, as depicted in the thermocouple circuit.

To measure process temperature accurately, one end of the thermocouple must maintain contact with the process (hot or measurement junction), while the other end remains at a constant temperature (cold or reference junction).

Key Takeaways:

  • Self-Powered Operation: Thermocouples generate millivolt-level voltage when exposed to heat.
  • Temperature Dependency: Voltage at each junction varies with temperature, enabling precise temperature measurement.
  • Hot and Cold Junctions: The end in contact with the process is the hot junction, while the one at constant temperature serves as the cold junction.

Understanding thermocouple principles is essential for leveraging their capabilities in temperature measurement across various industrial applications.

Click here to explore more about Blaze Technical Services’ expertise in thermocouple solutions.

Article with all rights reserved, courtesy of

Photo with all rights reserved, courtesy of