LT-2026
23
EN
DV5HH
The heated humidifi er connects mechanically and electrically
to a DV5X series PAP between the air stream going from the
PAP to the patient. The keypad on the PAP controls the heated
humidifi er’s output and ON/OFF functions. Before operation,
the humidifi er chamber is fi lled with water to a predefi ned
and visible water-fi ll level with the patient tubing and patient
interface attached to the outlet port on the heated humidi-
fi er system.
During operation, the DV5X series PAP device routes AC
electrical power (100 – 240 VAC 50/60 Hz) to the heated
humidifi er’s drive circuitry, which is contained within the PAP
device. The drive circuitry directs the AC power to the heating
element on the heated humidifi er’s heater plate. A thermistor
on the heater plate provides continuous feedback back to the
control circuitry so that the temperature of the heater plate is
consistent with the setting selected via the PAP’s keypad. The
PAP’s internal switch-mode power supply routes DC electrical
power to the heater’s low-voltage circuitry.
The heated humidifi er’s heater plate transmits heat to the
chamber, and then to the water, through a heat transfer plate
located on the bottom of the humidifi er chamber. As the wa-
ter is heated, its evaporation effi ciency increases. Air fl owing
into the humidifi er chamber from the PAP device is humidi-
fi ed by the evaporation and is then transmitted to the patient
through the patient tubing and interface.
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