6
LT-2027
EN
An AC line cord (100-240 VAC, 50/60 Hz) or a DC line cord (12 VDC) supplies electrical
power to the DV54 PAP. The PAP converts the AC input voltage to DC voltage by means
of an internal switch mode power supply and uses the DC voltage to power the internal
electronics of the unit, such as microcontroller, motor control circuitry, blower, LCD
display, etc. NOTE: The heated humidifi er will not operate when the PAP uses external
DC power.
The PAP produces positive pressure by spinning a reverse-curved impeller with a brush-
less DC motor. Room air is drawn through a fi lter into the blower, pressurized in the
blower, optionally passed through a heated humidifi er chamber, and then discharged
through a 22mm-ID, smooth-bore tube. Pressure regulation is achieved using measured
pressure and fl ow as feedback.
The DV54 PAP senses patient breathing by monitoring the fl ow transducer signal which
detects the fl uctuations caused by inhalation and exhalation. The fl ow transducer signal also
triggers mask-OFF alerts and auto-ON / auto-OFF functionality.
In AutoAdjust mode, the DV54 software analyzes the fl ow transducer signal to detect
respiratory events such as apneas, hypopneas, mixed apneas, snoring, and exhale puff-
ing as defi ned by programmable settings. An onboard algorithm evaluates the detected
respiratory events and adjusts the pressure as follows: The DV54 PAP increases output
pressure when it detects apneas, hypopneas, and snoring events; it maintains pressure
when it detects mixed events; and it decreases pressure on a regular timed interval as
the number of recent respiratory events decreases.
2. D escrip tion of N ormal O p eration
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