A System, comprising a portable sterile sensor device that comprises the following: an electronic sensor component for measuring a physiological pressure at a measurement site of the body of a patient, a measurement site interface for connecting the electronic sensor component to measurement site connection means for establishing a hydraulic connection as a measurement connection between the electronic sensor component and the measurement site, said measurement site connection means comprising a pressure transmitting hose element, a patient monitor interface for connecting the electronic sensor component to patient monitor connection means for establishing a signal connection between the electronic sensor component and a patient monitor, and a sensor housing for accommodating the electronic sensor component, the measurement site interface, and the patient monitor interface, wherein the patient monitor interface has an input channel (17, 21) for receiving a data signal from the patient monitor, the portable sensor device comprises at least one electronic additional component (18a, 22a) that can be influenced by the data signal, wherein said physiological pressure is a blood pressure, the system further comprises an additional pressure sensor and second sensor connection means, characterized in that said sensor device comprises a pressure line interface to which the second sensor connection means are connected which establish a hydraulic connection between the pressure-transferring hose element connectable to said measurement site interface and the additional pressure sensor, and the sensor device is lighter than 100 grams. an electronic sensor component for measuring a physiological pressure at a measurement site of the body of a patient, a measurement site interface for connecting the electronic sensor component to measurement site connection means for establishing a hydraulic connection as a measurement connection between the electronic sensor component and the measurement site, said measurement site connection means comprising a pressure transmitting hose element, a patient monitor interface for connecting the electronic sensor component to patient monitor connection means for establishing a signal connection between the electronic sensor component and a patient monitor, and a sensor housing for accommodating the electronic sensor component, the measurement site interface, and the patient monitor interface, wherein the patient monitor interface has an input channel (17, 21) for receiving a data signal from the patient monitor, the portable sensor device comprises at least one electronic additional component (18a, 22a) that can be influenced by the data signal, wherein said physiological pressure is a blood pressure, the system further comprises an additional pressure sensor and second sensor connection means, characterized in that said sensor device comprises a pressure line interface to which the second sensor connection means are connected which establish a hydraulic connection between the pressure-transferring hose element connectable to said measurement site interface and the additional pressure sensor, and the sensor device is lighter than 100 grams.