PT100 temperature sensor circuit diagram

Photocoupler

Working principle: The amplifier circuit adopts LM358 integrated operational amplifier. In order to prevent the nonlinear error caused by too high single-stage amplification, the amplifier circuit adopts two-stage amplification, as shown in Figure 5.1. The previous stage is about 10 times, the latter stage. About 3 times. The temperature changes from 0 to 100 degrees. When the temperature rises, the resistance of Pt100 becomes larger, the differential signal of the input amplifier circuit becomes larger, and the output voltage Av of the amplifier circuit rises accordingly.
R2, R3, R4 and Pt100 form the sensor measurement bridge. In order to ensure the stability of the bridge output voltage signal, the input voltage of the bridge is stabilized to 2.5V through the TL431. The differential signal obtained from the bridge is amplified by a two-stage op amp and input to the microcontroller. One bridge of the bridge uses an adjustable resistor R3. By adjusting R3, the differential voltage signal input to the op amp can be adjusted, usually used to adjust the zero point.
Note: Although the bridge part has been regulated by TL431, the voltage VCC of the whole module must be stable. Otherwise, as the VCC fluctuates, the operating voltage of the op amp LM358 fluctuates, and the output voltage Av fluctuates, eventually resulting in The result of the A/D conversion fluctuates and the measurement results jump up and down.

PT100 temperature sensor circuit diagram

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