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Difference Between Thermocouple and RTD

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1. The most common thermal resistance material is a single metal, and the widely used thermal resistance materials are platinum and copper. The scale numbers of the thermal resistance are Cu50, Pt100, Pt1000, etc. The letters in front refer to the material of the thermal resistance, and the numbers at the back are the resistance of the thermal resistance. Thermocouples are made by connecting two conductors of different compositions (called thermocouple wires or thermodes) at both ends into a loop. Common K-type thermocouples are composed of nickel-chromium-nickel-silicon.


2. Temperature measurement range


Thermal resistance is a commonly used temperature sensor in medium and low temperature areas. It is divided into platinum thermal resistance, copper thermal resistance, etc., and the temperature measurement range is also different. Generally speaking, RTDs can measure temperatures from -200 to 600°C. Thermocouples have a wide temperature measurement range and can measure temperatures from 0 to 1800°C. Ordinary K-type thermocouples can also measure temperatures from -40 to 1200°C.

3. Connection method


At present, there are two main connection methods of thermal resistance: two-wire, three-wire and four-wire. The two-wire system is relatively less accurate, while the four-wire system is more used for precision measurements in the laboratory. We usually use three wires. Thermocouples are generally connected in a two-wire system. Unlike the resistance output of thermal resistors, the output of thermocouples is a mV signal.

2022年7月15日 15:08