Instructions for use Babylog 8000 plus SW 5.n
155
Principles of operation
O
2
concentration measurement
The O
2
sensor (N) continuously measures the
inspriatory O
2
concentration via the pneumatic
control valve (L).
An automatic two-point calibration is performed
regularly every 24 hours: Air is directed to the
pneumatic control valve (L) via the magnetic
valves (G), (H) and (I). This closes the connection
between the O
2
sensor (N) and the inspiratory line.
The pneumatic control valve (O) is opened while
the O
2
sensor (N) is simultaneously flushed with
air via the metering system (M) for
approx. 2.5 minutes. The sensor is then flushed
with O
2
in a similar manner. After the calibration,
the magnetic valve (G) switches back to air, the
magnetic valve (I) closes, the pneumatic control
valve (O) closes, and the pneumatic control valve
(L) reconnects the O
2
sensor with the inspriatory
line.
Airway pressure measurement
The two relative pressure absorbers (Q) and (V)
determine the pressure on the entry and exit sides
of the breathing circuit. The device determines the
airway pressure at the Y-piece by means of the
pressure drop caused by the continuous flow in the
breathing circuit.
The bactericide section of pressure measurements
(U) prevents contamination of the pressure
absorber (V) with expiration gas.