Principles of Operation
132
Instructions for Use Oxylog 3000 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
breathing) 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, Ppeak, Pplateau, Pmean.
The plausibility of this airway pressure
measurement on the patient side is monitored by a
redundant internal airway pressure measurement
in the ventilator via S4 in the inspiratory duct.
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