Principles of Operation
122
Instructions for Use Oxylog 2000 plus SW 1.n
Safety
In the event of a fault, gas blender V1-3 closes and
pressure control V6 opens to the atmosphere. The
pneumatic demand valve NV (spontaneous breath-
ing) opens in the presence of negative pressure.
The pneumatic relief valve SV (set to approximately
80 mbar) opens in the presence of excess
pressure.
Monitoring
The flow measured on the patient side by S8 is
transmitted to the internal electronic pressure
difference sensor S6 as a differential pressure
signal. The measured monitoring values of the tidal
volume, minute volume and respiratory rate are
derived from the measured expiratory flow. The
inspiratory flow signal is used for detection of the
flow trigger. System leakages can be identified from
the balance of inspiratory and expiratory tidal
volumes (e.g. leakage alarm, NIV).
Airway pressure measurement on the patient side
supplies the Paw values for the airway pressure on
the display via S5, as well as for the derived
measured values PEEP, PIP, Pplat, Pmean. The
plausibility of this airway pressure measurement on
the patient side is monitored by a redundant inter-
nal airway pressure measurement in the ventilator
via S4 in the inspiratory duct.
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