The working principle of wear-resistant thermocouples is mainly based on the thermoelectric effect, which determines the temperature by measuring the thermoelectric potential difference generated at the connection points of different metal or alloy wires under temperature differences. Wear resistant thermocouples are composed of wires connected by two different metals or alloys, and there is a certain linear relationship between the thermoelectric potential generated by these two wires and temperature.

Specifically, when two different conductors or semiconductors A and B form a circuit with their two ends connected to each other, an electromotive force will be generated in the circuit, and the direction and magnitude of this electromotive force are related to the material of the conductors and the temperature of the two junctions. This electromotive force consists of two parts, one is the contact electromotive force of two conductors, and the other is the temperature difference electromotive force of a single conductor.

Wear resistant thermocouples have various characteristics, such as simple assembly, easy replacement, good seismic performance of spring-loaded temperature sensing elements, high measurement accuracy, large measurement range, fast thermal response time, high mechanical strength, high temperature resistance, and long service life. These characteristics enable wear-resistant thermocouples to work stably in various harsh environments, especially in temperature measurement of flowing powders and materials in industries such as petrochemicals, coal transportation systems, fluidized bed boilers, etc. where protective tubes are severely worn.

In the practical application of wear-resistant thermocouples, there are also some laws involved, such as the homogeneous conductor law, the intermediate conductor law, and the intermediate temperature law, which provide theoretical basis for the design and use of thermocouples.

In summary, wear-resistant thermocouples play an important role in temperature measurement due to their working principle and excellent performance, providing reliable temperature measurement methods for industrial production and scientific research.