This article introduces a pressure automatic control device. The applied voltage compensates the thermal sensitivity of the pressure sensor through the excitation of the thermistor. The output signal of the pressure sensor is compensated for the thermal zero drift through the differential cross-paralysis of the thermistor, and is amplified to a full scale of 4V~5V by the secondary operational amplifier circuit, and then transmitted to the comparison control circuit. The amplified pressure output signal and the two high and low pressure limit reference voltages of the voltage divider circuit are respectively input into the differential amplifier for comparison. After comparison, the output signal controls the on and off of the transistor, thereby controlling the working state of the relay and completing the automatic adjustment of the pressure.
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