In the development of the industrial wave, thermal resistance and thermocouple inspection instruments have been used a lot, which has changed people's level of temperature control. Through the use of such instruments, the process of industrial production can be monitored and controlled in an all-round way. . In fact, everyone does not know much about the inspection principle of thermal resistance and thermocouple. In fact, there are certain differences in the basic principles of measurement of thermal resistance and thermocouple, and they also have certain common points and similarities. Thermal resistance is mainly based on the principle of thermal effect of resistance to sense temperature. Its specific explanation is that the resistance of the resistor body changes with the change of temperature. Therefore, as long as there is a temperature fluctuation, even a small fluctuation, the thermal resistance can sense it, and the temperature can be accurately measured to achieve the design effect requirements. At present, according to the different thermal resistance wires, it is mainly divided into two types of thermal resistances: metal thermal resistance and semiconductor thermistor. The resistance value and temperature of precious metal thermal resistance can usually be expressed by the following approximate relationship, that is, Rtu003dRt0[1+α(t-t0)] In the formula, Rt is the resistance value at temperature t; Rt0 is the temperature t0 (usually t0u003d0°C) corresponds to the resistance value; α is the temperature coefficient. The relationship between the resistance value and temperature of the semiconductor thermistor is Rtu003dAeB/t where Rt is the resistance value when the temperature is t; A and B depend on the constant of the structure of the semiconductor material.
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