Chapter 3: Theory of Operation
Tranquility Quest Plus CPAP System Service Manual
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The ramp feature lets the user reduce the pressure from the unit so
that the patient can fall asleep at a lower, more comfortable pressure
at any time or as many times as needed during the night.
The patient circuit is made up of the flexible tubing, exhalation port,
and nasal mask. The unit applies CPAP to the patient’s upper
airway to keep the airway open during the sleep. Air flow gener-
ated from the unit is directed to the patient via a mask and flexible
tubing that connects to the air outlet port of the unit.
The Tranquility Quest Plus is intended to deliver CPAP therapy
only. It is not intended for life support or life sustaining applica-
tions.
Chapter 3: Theory of Operation
3.1 Functional Description
The Tranquility Quest Plus is a microprocessor-controlled Continu-
ous Positive Airway Pressure (CPAP) device that produces positive
pressure. The unit operates only in the CPAP Mode. CPAP Mode
pressure range: 3.0 – 20.0 cm H
2
O.
Integral to the generation of air flow is the blower assembly. Ambi-
ent air is drawn through the air intake filter by the energized blower
and is then pressurized. Ultimately, therapeutic pressure is pro-
vided to the patient via the patient circuit. The microprocessor
regulates the motor speed, which in turn adjusts and controls the
pressure.
The Tranquility Quest Plus’s control pad, which includes three push
buttons and an LCD display is the primary means by which the
patient therapy is controlled. Patients have limited access to unit
parameters.
The unit may be powered from AC voltage (100-240 VAC). AC
power enters the unit via an AC inlet and appropriate power cord.
The two system filters, the pollen and the ultra-fine, ensure opti-
mum operation for the user. An air outlet port allows for connec-
tion to the patient circuit.