Northern Meditec Crius V6, Operator'S Manual

Page: 154 / 182

154 / 182
for a period of time, dust or foreign substance absorbed on the surfaces of the two filters at
the Air inlet can occlude the Air inlet when the dust or foreign substance is accumulated to a
certain extent. This may cause insufficient Air intake of the machine and compromise the
ventilation performance of the machine. Vacuum sensor (P1) at the Air inlet monitors the
vacuum at the Air inlet in real-time, effectively judges filter occlusion at the Air inlet, and
gives the replacement prompt.
Check valve (CV1) ensures unidirectional flow of low-pressure O
2
. Filter (F1) filters foreign
substance in the high-pressure O
2
supply. Regulator (REG) regulates and stabilizes the
pressure of high-pressure O
2
supply to ensure the stability and repetitiveness of flow
outputted by the rear proportional solenoid valve (PSOL).
Filter screen (F4) is placed before the flow sensor to stabilize gas flow for the convenience of
sensor measurement. Flow sensor (Q1) is a hot-wire mass flow sensor which does not require
calibration.
The gas supply part includes three parallel limbs: high-pressure O
2
, low-pressure O
2
, and
low-pressure Air. The high-pressure O
2
and low-pressure O
2
converge before mixing with Air.
High-pressure O
2
and low-pressure O
2
cannot be used at the same time. Flow sensor (Q1) is
placed at the common outlet of low-pressure O
2
and high-pressure O
2
to monitor O
2
. Room air
enters the machine after passing through filter (F2) and HEPA filter (F3).
Turbine blower (Blower) inhales the room air and externally connected O
2
and outputs them
to the rear end of the inspiratory limb after compression. The turbine blower module contains
two levels of labyrinth, which are located in the upstream and downstream of the turbine
blower respectively. Air and O
2
are inhaled by the turbine blower after going through the first
level of labyrinth chamber (SD1). The mixed gas of Air and O
2
is then compressed by the
turbine blower and enters the second level of labyrinth chamber (SD2). These two levels of
labyrinth chamber mix Air and O
2
and reduce noise. The turbine blower motor has a thermal
conductive metal piece which conducts heat for heat dissipation via a cooling fan.
The large-diameter inspiration valve (Insp. valve) controls inspiratory pressure or flow. This
valve uses voice coil motor as the driving component. In case of power failure, the valve port
is automatically sealed via spring preload. When the voice coil motor takes actions, the valve
port opens. Different output flows or pressures are acquired by exerting different control
currents to the voice coil motor.
The outlet of large-diameter inspiration valve is connected to flow sensor (Q2) which
monitors the flow in the inspiratory limb. Flow sensor (Q2) is a hot-wire mass flow sensor
which does not require calibration. O
2
sensor (OS) monitors O
2
volume percentage
concentration in the inspiratory limb.