Let's see how thermocouples work

Although the difference between thermocouples and thermal resistances are touch temperature measurement surfaces, their temperature measurement scales are different. Thermocouples are used in higher temperature environments, because they output thermoelectric potential in the middle and low temperature regions. When the potential is small , The opposite interference method and secondary table and requirements are very high, otherwise the measurement is prohibited, and also, in the lower temperature area. The relative error caused by the change of the temperature of the cold end and the change of the ambient temperature is very obvious, and it is not easy to obtain full compensation. Lower temperature (for example, a low temperature of about 1K can be measured with a carbon resistor). Now the platinum thermal resistance Pt100 is used normally. (There are also Pt50, copper resistance is also used in industry, but the temperature measurement scale is small, between 150 ~ 150 ° C. In some special occasions, there are indium resistance, manganese resistance, etc., Temperature measurement principle The basic principle of thermocouples to measure temperature is the thermoelectric effect, and the secondary meter is a voltmeter or an electronic potentiometer to improve accuracy. Resistance is based on the characteristics of the resistance value of conductors and semiconductors that change with temperature. Yes, the secondary meter is an unbalanced bridge, and the thermocouple is judged on the spot during the operation. The thermocouple has positive and negative poles, and the compensation wire also has positive and negative points. First of all, ensure that the connection and equipment are correct. During operation, there is a common short circuit , open circuit, poor touch (distinguished by a multimeter) and metamorphosis (distinguished by appearance color).

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