The working principle, indexing characteristics and allowable deviation of the compression spring type fixed thermocouple, the temperature compensation of the reference junction (cold junction), and the connection method with the display measuring instrument are the same as those of the general thermocouple. The structure of the compression spring fixed thermocouple consists of a protection tube and mounting bolts. It is composed of locking ferrule, spring and thermocouple wire. The homogeneous conductor of different components of the compression spring fixed thermocouple is the hot electrode, the higher temperature end is the working end, the lower temperature end is the free end, and the free end is usually at a constant temperature. According to the functional relationship between thermoelectromotive force and temperature, a thermocouple graduation table is made; the graduation table is obtained under the condition that the temperature of the free end is at 0°C, and different thermocouples have different graduation tables. When the third metal material is connected to the compression spring fixed thermocouple loop, as long as the temperature of the two contacts of the material is the same, the thermoelectric potential generated by the thermocouple will remain unchanged, that is, the third metal will not be connected to the loop. Impact. Therefore, when measuring the temperature of the thermocouple, the measuring instrument can be connected, and the temperature of the measured medium can be known after measuring the thermoelectromotive force. When a thermocouple measures temperature, the temperature of its cold end is required to remain unchanged, and its thermoelectric potential is proportional to the measured temperature. If the temperature of the cold end changes during measurement, it will seriously affect the accuracy of the measurement. Taking certain measures at the cold junction to compensate for the influence caused by the temperature change of the cold junction is called the cold junction compensation of the thermocouple is normal. Special compensation wire for connecting with measuring instrument.
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