System for automatic zeroing and for electronic adjustment of the level of a pressure transducer, wherein the automatic zeroing and the electronic adjustment are applied to vital signs monitors, wherein the system comprises of a circuit and a software working together, wherein the circuit uses two differential amplifiers with inputs inverted to each other to remove the value of the virtual ground voltage from a pressure calculation, wherein the system electronically adjusts the level of the pressure transducer in relation to a patient, through the software for value compensation in mmHg related to level difference in cmH 2 O informed by a user by means of a monitor interface on the vital signs monitors, according to the equation: Pressure = ValueCH 1 − ValueCH 2 × scaleAdjustment + levelAdjustment where: • Pressure - final pressure value calculated in mmHg; • ValueCH1 - number value achieved by analogic-to-digital converter corresponding to output signal of differential amplifier 1; • ValueCH2 - number value achieved by analogic-to-digital converter corresponding to output signal of differential amplifier 2; • scaleAdjustment - conversion factor of value achieved by analogic-to-digital converter for value in mmHg; • levelAdjustment - value in mmHg, corresponding to level difference in cmH 2 O between the patient and the pressure transducer, informed by the user through the interface on the vital signs monitors. wherein the automatic zeroing and the electronic adjustment are applied to vital signs monitors, wherein the system comprises of a circuit and a software working together, wherein the circuit uses two differential amplifiers with inputs inverted to each other to remove the value of the virtual ground voltage from a pressure calculation, wherein the system electronically adjusts the level of the pressure transducer in relation to a patient, through the software for value compensation in mmHg related to level difference in cmH 2 O informed by a user by means of a monitor interface on the vital signs monitors, according to the equation: Pressure = ValueCH 1 − ValueCH 2 × scaleAdjustment + levelAdjustment where: • Pressure - final pressure value calculated in mmHg; • ValueCH1 - number value achieved by analogic-to-digital converter corresponding to output signal of differential amplifier 1; • ValueCH2 - number value achieved by analogic-to-digital converter corresponding to output signal of differential amplifier 2; • scaleAdjustment - conversion factor of value achieved by analogic-to-digital converter for value in mmHg; • levelAdjustment - value in mmHg, corresponding to level difference in cmH 2 O between the patient and the pressure transducer, informed by the user through the interface on the vital signs monitors. • Pressure - final pressure value calculated in mmHg; • ValueCH1 - number value achieved by analogic-to-digital converter corresponding to output signal of differential amplifier 1; • ValueCH2 - number value achieved by analogic-to-digital converter corresponding to output signal of differential amplifier 2; • scaleAdjustment - conversion factor of value achieved by analogic-to-digital converter for value in mmHg; • levelAdjustment - value in mmHg, corresponding to level difference in cmH 2 O between the patient and the pressure transducer, informed by the user through the interface on the vital signs monitors.