Understand some related issues of thermocouples

The cold junction temperature of the thermocouple is also called cold junction reference temperature, cold junction temperature and reference temperature. As a thermocouple itself, it is a component with a reaction temperature difference, and the millivolt value it produces is only related to the temperature difference between the hot end and the cold end. If one end is 100°C and the other end is 20°C, the millivolt value generated by the thermocouple itself is only equivalent to 80°C. For example, when used for temperature measurement. The object will be measured at 100°C and the environment will be 20°C. In this case, when the millivolt value is 80°C, the temperature of the measured object can be obtained by adding the ambient temperature to 20°C. The 20°C (ambient temperature) is the reference temperature of the cold junction. Most temperature measuring instruments can automatically detect and automatically add the cold junction temperature, which is called automatic cold junction compensation. The automatic cold junction compensation or manual correction should be turned off when checking the table. The thermoelectric potential of the thermocouple is related to the temperature of the thermoelectrode material and the two junctions. Both the graduation table of the thermometer and the thermometer based on the graduation table are based on the condition that the reference terminal temperature of the thermocouple is equal to 0°C. Therefore, this condition must be observed when using. If the reference terminal temperature tn is not equal to 0°C, although the measured temperature t is constant, the thermoelectric potential E(t, tn) will also change with the reference terminal temperature tn, for example, when the reference temperature of the thermocouple When it is 0°C, we insert a nickel-chromium-nickel-silicon thermocouple into a 600°C tubular electric furnace. The output thermoelectric potential is 24.91mV.

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