Dräger Babylog 8000 plus Instructions For Use Manual page 155

O concentration measurement
2
The O sensor (N) continuously measures the
2
inspriatory O concentration via the pneumatic
2
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 sensor (N) and the inspiratory line.
2
The pneumatic control valve (O) is opened while
the O sensor (N) is simultaneously flushed with
2
air via the metering system (M) for
approx. 2.5 minutes. The sensor is then flushed
with O in a similar manner. After the calibration,
2
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
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.
Instructions for use Babylog 8000 plus SW 5.n
sensor with the inspriatory
Principles of operation
155