How are thermocouples used

Although the difference between thermocouple and thermal resistance is touch-type temperature measurement surface, their temperature measurement scale is different. Thermocouples are used in higher temperature environments, because they output thermoelectric potential in the medium and low temperature areas, and when the potential is small , The opposite disturbance method and the secondary table and requirements are very high, otherwise the measurement is forbidden, and also, in the lower temperature area. The relative error caused by the change of the cold junction temperature and the change of the ambient temperature is outstanding, and it is not easy to be fully compensated. At this time, the temperature measurement scale of the thermal resistance is generally 200~500℃, and even can be measured at the low temperature. Lower temperature (for example, a low temperature of about 1K can be measured with a carbon resistor). Nowadays, platinum thermal resistance Pt100 is normally used. (There is also Pt50, copper resistance is also used in industry, but the temperature measurement scale is small, between 50~150℃. In some special occasions, there are indium resistance, manganese resistance, etc., The basic principle of temperature measurement by thermocouple is the thermoelectric effect. The secondary meter is a voltmeter or an electronic potentiometer is used to improve accuracy. Resistance is based on the characteristics of the resistance of conductors and semiconductors that change with temperature. Yes, the secondary meter is an unbalanced bridge. The thermocouple is judged on site during operation. The thermocouple has positive and negative poles, and the compensation wire also has positive and negative points. The first thing to do is to ensure that the connection is correct and the equipment is correct. In operation, short circuits are common , Open circuit, bad touch (can be distinguished by a multimeter) and metamorphosis (identified by appearance color).

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