The cold junction temperature of a thermocouple is also known as cold junction reference temperature, cold junction temperature and reference temperature. As a thermocouple itself, it is a component with a reactive temperature difference that produces a millivolt value that is only related to the temperature difference between the hot and cold junctions. If one end is 100°C and the other end is 20°C, the millivolt value produced by the thermocouple itself is only equivalent to 80°C. For example, when used for temperature measurement. The object of 100°C will be measured, and the environment is 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. This 20°C (ambient temperature) is the cold junction reference temperature. Most temperature measuring instruments can automatically detect and automatically add the cold junction temperature, called automatic cold junction compensation. However, he will become redundant at school, so automatic cold junction compensation should be turned off or manual correction when checking the table, the thermoelectric potential of the thermocouple is related to the temperature of the thermode material and the two junctions. The thermometer's graduation table and the thermometer scaled according to the graduation table are based on the condition that the temperature of the thermocouple reference terminal is equal to 0°C. Therefore, this condition must be followed when using it. 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) also varies with the reference terminal temperature tn, for example, when the reference temperature of a thermocouple At 0°C, we inserted a NichromeNiSi thermocouple into a tubular furnace at 600°C. The output thermoelectric potential is 24.91mV.
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