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Function Description Savina Version 2.0
In normal operation of the unit the solenoid valve V4 is set to "measurement" - that is, the
connection between the inspiration and the oxygen sensor is open. During O
2
sensor calibration it
opens the way for the oxygen to the sensor. This layout permits online calibration of sensor S3.1
during ventilation. Sensor S3.2 must be calibrated manually (patient disconnected).
The absolute pressure sensor S6 delivers the measured atmospheric pressure value required for
O
2
measurement and for volume application. Absolute pressure sensor S7 monitors sensor
Sensor S3.1 delivers the signal for the displayed value FiO
2
and the signal for control of the
inspiratory O
2
concentration. Sensor S3.2 monitors sensor S3.1.
The pressure sensor S4.1 measures the pressure in the inspiratory branch. The sensor signal, in
conjunction with the expiratory pressure sensor S4.2, measures, controls and monitors the airw
pressure. The airway pressure is measured on the basis of the measured value from the pressure
sensor in the respective no-flow branch. Pressure sensor S4.3 continuously measures
pressure. The measured value is required to regulate the blower.
Solenoid valves V6.1, V6.2 and V6.3 calibrate the inspiratory pressure sensors and the
pressure sensor. During calibration, the corresponding valve interrupts the connection to the
ventilation circuit and switches the sensor to ambient pressure.
