September 2013
2010-8403CE Rev C
7
5.2. Materials in direct or indirect contact
with the patient
Concentrator casing ................................ABS
Power Cord ........................................... PVC
Cabinet Air Filter ..............................Polyester
I
/0
(On/Off) switch................................Nylon
Casters....................................................Nylon
Flow adjustment knob..............................ABS
Oxygen product outlet ...................Aluminum
Printed labels.............................Polycarbonate
Pipe/Tubing..........................Aluminium,PVC,
polyurethane or silicone
Humidifi er.................................Polypropylene
Humidifi er tube........................................PVC
Filter .........................................Polypropylene
5.3. Operating principle
The compressor sends fi ltered room air to a
solenoid valve, which allows compressed air to
pass to the column in production. The columns
contain a molecular sieve, whose function is
to adsorb the nitrogen and thus allow oxygen
to pass. The oxygen enriched product is then
directed through a pressure reducing valve to
the adjustable fl ow valve and continuing to the
oxygen product outlet fi tting.
During this time, the column which is being
"regenerated" is connected to the ambient air
and fl ow of oxygen enriched product is passed
through it (from the column "in production"). In
this way, when one column is in production, the
other is in a nitrogen desorption or "regenera-
tion" phase. The oxygen enriched product fi nally
passes through a fi nal product fi lter located prior
to the oxygen outlet fi tting.
5.4. Alarms - Safety devices - Indications
5.4.1. Alarms
•
No voltage detection
In the event of a loss of mains power, an inter-
mittent audible alarm is activated and the green
light turns off. Test alarm by actuating the
I
/
O
(ON/OFF) switch when the power cord is not
plugged into the wall outlet.
7
•
Process fault
In the case of a process fault, a visible and au-
dible alarm is activated (continuous red light or
lighted alarm and audible alarm).
•
Oxygen Concentration
If the oxygen concentration level falls below the
required range the red light comes on and the
green light goes out. After a 15 minute delay
the audible alarm will sound.
•
Blocked Cannula
If the oxygen fl ow is blocked within the can-
nula and remains so for 5 seconds the red
indicator in addition to the green indicator
will be illuminated. Also, an audible alarm
will sound.
5.4.2. Safety devices
•
Compressor motor
Thermal safety is ensured by a thermal switch
situated in the motor winding (145 ± 5
o
C).
•
Electrical protection
A 5A circuit breaker is incorporated into the
front cabinet of all models.
Class II devices with insulated casings
(EN60601-1 standard)
•
Safety valve
This is fi tted on the compressor outlet and is
calibrated to 2.7 bar (40 psig).
5.4.3 Indicators
•
The green indicator light (Fig.5.1) indicates
that power is applied to the device. When
fi rst turned on the indicator will fl ash until
correct oxygen concentration is achieved.
At that time the green indicator will remain
illuminated and the device is ready to provide
oxygen enriched air to the patient.
