The Relationship between Thermoelectric Potential and Temperature of Thermocouples

Thermocouple calculation from millivolts to temperature: measure the cold junction temperature, convert it to the corresponding millivolt value, add it to the millivolt value of the thermocouple, and convert it to temperature. From temperature to millivolts: Measure the actual temperature and cold end temperature, convert them into millivolts, subtract them to obtain the millivolt value, and then obtain the temperature.

Thermocouple thermoelectric potential:

1: The thermoelectric potential of a thermocouple is the difference in temperature function between the two ends of the working end of the thermocouple, rather than the temperature difference between the cold end and the working end of the thermocouple;

2: The magnitude of the thermoelectric potential generated by a thermocouple is independent of its length and diameter when the material of the thermocouple is uniform,

3: After the composition of the two thermocouple wires is determined, the magnitude of the thermoelectric potential of the thermocouple is only related to the temperature difference of the thermocouple; If the temperature of the cold end of the thermocouple remains constant, the thermoelectric potential entering the thermocouple is only a single value function of the working end temperature.

Thermocouples weld two different materials of conductors or semiconductors A and B together to form a closed circuit, as shown in the figure. When there is a temperature difference between the two attachment points 1 and 2 of conductors A and B, an electromotive force is generated between them, resulting in a current of a certain magnitude in the circuit. This phenomenon is called thermoelectric effect. Thermocouples work by utilizing this effect.

Regarding the thermoelectric potential of thermocouples, we need to follow the above precautions to ensure their normal operation. We are a professional thermocouple manufacturer, providing you with instruments that are very suitable for you. Ensure lower prices within the same quality range and better quality within the same price range.