Thermocouple and thermal resistance temperature sensor

Thermocouple temperature measurement is the most widely used in the temperature of the device, his main characteristic is the wide temperature range, stable performance, at the same time, simple structure, good dynamic response, more can far eastone - 4 20 ma electrical signals to facilitate automatic control and centralized control. Thermocouple temperature measurement principle is based on thermoelectric effect. Connect the two different conductor or semiconductor into closed loops, when the two contacts in temperature is not at the same time, the circuit will produce thermoelectric potential, this kind of phenomenon called the thermoelectric effect, known as the seebeck effect.

there are two kinds of structure of the thermocouple, regular and armor type. Ordinary thermocouples generally by the hot electrode, insulation tube, to protect casing and junction box parts, such as type and armoured thermocouple is the thermocouple wire, insulation material and metal protective casing combination after assembly, after stretching processing from a combination of a solid.

pt100pt1000 although thermal resistor is widely applied in industry, but because of his temperature range makes his application by certain restrictions, thermal resistance temperature measurement principle is based on a conductor or semiconductor resistance changes with the change in temperature. Its many advantages, can also remote transmission signal, high sensitivity, strong stability, compatibility and accuracy are better, but you need to power, can't instantaneous measured the change in temperature. Thermal resistance and thermocouple as the distinction between the type, but he does not need compensation conductor, and cheaper than thermocouple.

select the thermocouple or heat resistance is judged according to the measured object environment, a lot of people don't know exactly what to choose, so in choosing a temperature sensor needs to fully understand the difference between thermal resistance and thermocouple temperature sensor, as the temperature sensor can only choose to suit their own needs.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor