The pt100 temperature sensor is an instrument that converts temperature variables into standardized output signals that can be transmitted. Mainly used for the measurement and control of temperature parameters in industrial processes. Transmitter with sensor usually consists of two parts: sensor and signal converter. The sensor is mainly a thermocouple or thermal resistance; the signal converter is mainly composed of a measuring unit, a signal processing and conversion unit (because the industrial thermal resistance and thermocouple indexing table are standardized, the signal converter is also called as an independent product Transmitter), some transmitters increase the display unit, and some also have field bus function.
pt100 is a platinum thermal resistance, its resistance will change with temperature changes. The 100 after PT means that its resistance value is 100 ohms at 0°C, and its resistance value is about 138.5 ohms at 100°C.
How it works: When the PT100 is at 0 degrees Celsius, its resistance is 100 ohms, and its resistance will increase approximately at a uniform rate as the temperature rises. But the relationship between them is not a simple proportional relationship, but should approach a parabola.
The calculation formula that the resistance of platinum resistance changes with temperature changes:
-200《t》0℃ Rt=R0［1+At+Bt+C（t-100）t］ (1)
0《t》850℃ Rt=R0(1+At+Bt2) (2)
Rt is the resistance value at t°C, and R0 is the resistance value at 0°C. The coefficients of A and B in the formula are experimentally determined. standard
The coefficient is: A=3.90802*10-3℃; B=-5.802*10-7℃; C=-4.27350*10-12℃
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