What is the difference between thermocouple and thermal resistance

Thermocouple---a kind of sensor for measuring temperature. It is a temperature sensor like thermal resistance, but the main difference between it and thermal resistance is: 1. The nature of signal, thermal resistance itself is resistance, temperature change causes resistance to produce Positive or negative resistance changes; thermocouples produce changes in induced voltage, which changes with temperature changes. 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 it can detect negative temperatures), and the thermocouple can detect the temperature range of 0-1000 degrees (or even higher). Therefore, the former is Low temperature detection, the latter is high temperature detection. Third, from the point of view of the material, thermal resistance is a metal material, a metal material with temperature-sensitive changes, and a thermocouple is a bimetal material, which is two different metals. Due to temperature changes, the two different metal wires A potential difference is generated at the end.

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