Dräger Babylog 8000 Service Manual

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_ _Printed on_18.05.05_F61733XXT01.fm
34
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

Dräger Babylog 8000 Specifications

General

Leak Compensation	Yes
Type	Ventilator
Pressure Range	0 to 80 mbar
Tidal Volume Range	2-2000 mL
Frequency	1-150 breaths/min
Inspiratory Time	0.1-3.0 sec
PEEP	0 to 20 mbar
FiO2 Range	21-100%
Power Supply	100 to 240 V AC, 50/60 Hz