What is a thermocouple?

Posted by Admin | 19 Apr

Thermocouple is a common temperature detection sensor used to sense temperature. The working principle is that the temperature changes and the potential at both ends is different.

Thermocouple---a temperature sensor, it is a temperature sensor like a thermal resistance, but the main difference between it and a thermal resistance is:

First, the nature of the signal, the thermal resistance itself is a resistance, and the change of temperature causes the resistance to produce positive or negative resistance changes; while the thermocouple is the change of induced voltage, which changes with the change of temperature.

Second, the temperature ranges detected by the two sensors are different. The thermal resistance generally detects the temperature range of 0-150 degrees (of course, negative temperature can be detected), and the thermocouple can detect the temperature range of 0-1000 degrees (or even higher). Therefore, the former It is a low temperature detection, and the latter is a high temperature detection.

Third, in terms of materials, thermal resistance is a metal material, a metal material with temperature-sensitive changes, and a thermocouple is a bimetallic material, that is, two different metals, due to temperature changes, in two different metal wires. There is a potential difference across the two ends.