Thermocouples are made very long, so the cold junction extends to where the temperature is relatively stable. Since the thermocouple itself is not easy to lay and it is not economical for precious metal thermocouples, special wire is used to extend the cold junction of the thermocouple. The wire is also made of two different metallic materials at a certain temperature. In this range (below 100°C), it has the same or very similar thermoelectric properties as the connected thermocouple. This material is also an inexpensive metal. This type of wire is called a compensation wire. Note: Regardless of the compensation type or extension type, the compensation wire itself cannot compensate for changes in the temperature of the cold junction of the thermocouple, but is only used to extend the cold junction of the thermocouple and change the cold position. Within the specified range, since the thermoelectric characteristics of the compensation line cannot be exactly the same as that of the thermocouple, there is still a certain error. How to calculate and correct? When the thermocouple cooling temperature is not 0°C but t0, the thermoelectric potential measured in the thermocouple loop is E. It can be formally modified: it is only suitable for laboratory or temporary temperature measurement, it is obviously not feasible for continuous measurement in the field, Thermal resistance? In the low and medium temperature region, thermal resistance is a commonly used type of temperature detector. Its main features are high measurement accuracy and stable performance. Platinum resistance has high measurement accuracy and can be used as a reference instrument. Principle of temperature measurement: RTD thermometers are based on the principle that the resistance value of metal conductors or semiconductors has a certain functional relationship with temperature to achieve temperature measurement.
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