How to measure surface thermocouple

Surface thermocouple is used to measure the temperature of the surface of an object (container shell).

Its working principle is the same as that of a general thermocouple, and the main difference lies in the hot end structure.

One way is to make the hot end easily consistent with the temperature of the contact object. It is common in industry to press the hot end into a very thin spring piece and squeeze it to the surface of the measured object for measurement.

The other is to use the property that the sum of thermoelectric potentials generated by a thermocouple composed of two metals, B and C, when measuring the same temperature is equal to the thermoelectric potentials generated by a thermocouple composed of two metals, A and C, to separate the hot ends of the thermocouple and connect them to the metal surface (the metal surface to be measured is B as required) to measure the temperatures of two contacts (individuals).

In addition, because the thermocouple is in direct contact with the equipment in the measurement, the methods to counter electromagnetic interference are also different. Traditional methods are mainly floating and shielding, while surface thermocouples are mostly solved by filtering.