Care, Maintenance, and Tests
252
C.6 Turbine Unit
The turbine unit consists of a variable speed DC motor and a rotary compressor. The
turbine unit generates flow and pressure by changing motor speeds.
C.7 Turbine Pressure Sensor
This sensor measures the pressure at the ventilator outlet. The ventilator software uses
this value and the RPM of the turbine’s motor to control PEEP. The sensor also performs
as a backup device to the airway pressure sensor.
C.8 Turbine Valves
The two turbine valves of different sizes are electromechanical solenoid valves normally
closed during the inspiratory phase allowing the gas mixture to flow from the turbine
unit to the patient breathing circuit. During the expiratory phase, the valves are open to
release pressure in the patient circuit. An air path from the manifold and air inlet filter to
the patient breathing circuit is present.
C.9 Over Pressure Relief Valve
If the control system fails to limit the turbine pressure to a maximum level of 80 cmH
2
O,
this valve will relieve at 80 cmH
2
O.
C.10 Airway Flow and Pressure Sensors
A differential pressure transducer is attached to the patient breathing circuit at the
proximal airway. This device measures both inspired and expired values.
C.11 Pressure Switch
A pressure switch in the iVent
201
monitors whether sufficient Oxygen pressure is
connected to the unit (approximately 0.7 bar). If insufficient oxygen pressure is available,
a low O
2
pressure alarm occurs.
C.12 Inlet and Outlet Mufflers
An inlet muffler that sits just behind the air inlet filter and an outlet muffler just after the
turbine unit reduce the level of noise generated by the air flow in the system.
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