What is the principle of pt100 thermal resistance?
Thermal resistance is widely used in industry, and there are many types, which can meet the diversified needs of users. Among them, the pt100 thermal resistance is the most commonly used temperature sensor in the industry. It works on the principle that the resistance value of the metal platinum wire changes with temperature.
The principle of pt100 thermal resistance
pt100 thermal resistance, its resistance is proportional to the change of temperature. The relationship between the resistance value of pt100 and the temperature change is: when the temperature of pt100 is 0 ℃, its resistance value is 100 ohms, and its resistance value is about 138.5 ohms at 100 ℃.
Industrial principles
1. When the pt100 is at 0 degrees Celsius, its resistance is 100 ohms, and the resistance of the pt100 thermocouple will increase at a constant rate as the temperature rises.
2. The resistance value and temperature of the metal thermal resistance can generally be expressed by the following approximate relationship, namely rt=rt0[1+α(t-t0)] In the formula, rt is the resistance value at temperature t; rt0 is temperature t0 (usually t0=0℃) the corresponding resistance value.α is the temperature coefficient.
3. The relationship between the resistance value and temperature of the semiconductor thermistor is rt=aeb/t where rt is the resistance value when the temperature is t. a and b depend on the constants of the structure of the semiconductor material.
The above is about the principle of pt100 thermal resistance. I hope you can master this principle before using it, which can effectively help you use thermal resistance better.
