Dräger Babylog 8000SC, Техническое и сервисное руководство, Страница: 36 / 155

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Dräger Medical AG & Co. KGaA 6173.3
Function description Babylog 8000
9 Measurement of the Ventilation Parameters
9.1 O
2
Measurement
The O
2
sensor continuously measures the fraction of inspired O
2
through the open pneumatic valve Y 3.1.
Fig. 12: Measurement of the fraction of inspired O
2
.
An automatic two-step calibration is carried out at 24-hour intervals.
AIR is supplied to the pneumatic valve Y 3.1 through solenoids Y 1.1, Y 1.2, and Y 1.3. The pneumatic
valve Y 3.1 closes the connection between the O
2
sensor S 3.1 and the inspiratory line. The pneumatic
valve Y 3.2 is opened while, at the same time, the O
2
sensor is purged with AIR through the restrictor
R 3.2 for approximately 2.5 minutes.
Then, purging with O
2
is carried out in the same way. After calibration, the solenoid Y 1.1 switches back to
AIR, the solenoid Y 1.3 closes, the pneumatics valve Y 3.2 closes, too, and the pneumatics valve Y 3.1
reconnects the O
2
sensor to the inspiratory line.
9.2 Measurement of the Airway Pressure
Due to the continuous flow, the inspiratory measurement results in a value that is higher than the value
measured at the Y-piece. Since an expiratory measurement results in a value which is too low, an
average value is calculated from the measured values of the relative pressure sensors and displayed on
the screen.
A bactericidal metering pipe prevents contamination of the pressure sensor with expiratory gas.
Insp.
3a
10 11a
R3.1
Y3.1
Y3.3
Y3.2
F3.1
D3.1
S3.1