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As two contact temperature sensor, thermocouple and thermal resistance are two name only a word and measurement object can be used as a temperature sensor, principle and characteristics are different, but they are the following nine pure kin for everyone to see where they explain the difference between.
Thermal resistance: no wires to be compensated
First, we introduce the thermal resistance, heat resistance though 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 is much cheaper than thermocouple.
4-20 ma thermocouple: more far eastone electrical signals
Secondly, introduce thermocouple, 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 able to 4-20 ma electrical signal remote transmission, convenient 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, also 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.
To select the thermocouple or heat resistance 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.