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Technical data
53
9.1 Pneumatic / electronic systems
The input pressure at p is max. 6bar. This is dynamically reduced by V1 to 2.5 bar. This is the input pressure
at V2, V3 and V4.
Inspiration
An electrical impulse to V2 opens V3 and closes V4. Oxygen flows through the ventilation hose to the patient
valve. If the ventilation pressure in the patient valve reaches >100 mbar, the relief valve V5 will open.
Expiration
A fresh electrical impulse closes V2. The relief valve V4 opens and vents the ventilation hose. The patient
breathes out through the patient valve.
Demandflow
An inspiration impulse (trigger) at V2 opens valves V3 and V4.
Electronic system
The microprocessor-controlled electronic system sets the ventilation parameters and monitors ventilation, and
also O
2
supply and power supply. If necessary, a visual and acoustic alarm is given. The ventilator has an
audio response facility that can be switched on for user guidance.
Patient valve
During inspiration the ventilation gas flows to the patient.
During expiration the expiration pressure switches the valve so
that the patient can breathe out.