Thermocouple&RTD Knowledge

Principle of Pt100 thermal resistance

Pt100 thermal resistance are widely used in industry, and there are many types, which can meet the diverse needs of users. Among them, Pt100 thermal resistance is the most commonly used temperature sensor in the industry. It works on the principle that the resistance value of metal platinum wire changes with temperature. Let's take a closer look at the principle of Pt100 thermal resistance:

Pt100 thermal resistance its resistance is proportional to the change in temperature. The relationship between the resistance of PT100 and the temperature is: when the temperature of PT100 is 0 ° C, its resistance is 100 ohms, and at 100 ° C, its resistance is about 138.5 ohms. Its industrial principle: when PT100 is at 0 ℃, its resistance value is 100 ohms, and its resistance value will increase uniformly with temperature rise.

The resistance value and temperature of metal thermal resistance can generally be expressed by the following approximate relationship, that is,

Rt = Rt0 [1 + α (t-t0)]

In the formula, Rt is the resistance value at temperature t; Rt0 is the corresponding resistance value at temperature t0 (usually t0 = 0 ° C); α is the temperature coefficient. The relationship between the resistance and temperature of a semiconductor thermistor is

Rt = AeB / t

Where Rt is the resistance value at temperature t; A and B depend on the constant of the structure of the semiconductor material.


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