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IV.3. Operating principle
The compressor sends ltered ambient air to an electronic
valving system, 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 to a pressure
reducing valve through the adjustable ow meter to the
oxygen outlet tting.
During this time, the column which is being "regenerated"
is connected to the ambient air and 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 "regeneration" phase. The oxygen
enriched product nally passes through a bacterial lter located
prior to the oxygen outlet tting.
IV.4. Alarms - Safety devices
IV.4.1. Alarms
•
No voltage detection:
In the event of a loss of mains power, a continuous audible
alarm is activated and the green light turns off. Test alarm by
actuating the I/0 (On/Off) switch when the power cord is not
plugged into the wall receptacle.
•
Process fault:
In the case of a process fault, a visible and audible alarm is
activated (continuous red light or lighted alarm and audible
alarm, see p. 7)
.
•
No Oxygen Flow Alarm (Optional):
If supplied the Nuvo 8 Oxygen Concentrator has a No Flow
Alarm. This device provides an continuous audible alarm in
the event the Oxygen Flow to patient becomes blocked.
IV.4.2. Safety devices
•
Compressor motor:
Thermal safety is ensured by a thermal switch situated in the
o
stator winding (145 ± 5
•
Ambient air valve:
In the case of a negative pressure in the molecular sieve colu-
mns, this valve allows ambient air to enter.
•
Electrical protection of the Mark 5 Nuvo 8:
A 5A circuit breaker is incorporated into the front cabinet of
all 230V models. A 10 A circuit breaker is included with 115V
models.
•
Class II devices with insulated castings (EN60601-1
standard)
•
Safety valve:
This is tted on the compressor outlet and is calibrated to 3.4
bar (50 psig).
2010-2238CE Rev C
C).
IV.5. OCSI (oxygen concentration status indicator) func-
tion
IV.5.1. Operating principle
The oxygen monitor (6) is an electronic module capable of
checking the effective oxygen concentration supplied by the
Mark 5 Nuvo 8 concentrator.
The oxygen monitor measures the concentration and activa-
tes an audible and visual alarm if it falls below the alarm set
point percentage.
When the Mark 5 Nuvo 8 is started, the indicator lights
operates as follows:
IV.5.2. Green indicator (OCSI ONLY)
The green indicator light indicates that power is applied
to the concentrator and that it is ready to provide oxygen
enriched air to the patient. To be lighted, it is necessary that
the concentrator power plug be inserted into the wall outlet,
that the I/O (On/Off) switch be actuated and that the oxygen
concentration has reached the alarm set-point
IV.5.3. Red indicator (OCSI ONLY)
The red indicator light is used to warn the patient of a system
fault. The two events that can cause the red indicator to be
lighted are low oxygen concentration and loss of mains power.
The low oxygen concentration warning will light when the
oxygen concentration set point level is not reached. When
the red indicator light is lighted for 15 minutes (±2 minutes),
a continuous audible alarm is activated. Call the equipment
supplier to service the device.
IV.5.4. Maintenance of the device alarms
• No special maintenance is required. The alarm set-point is
factory set and the setting cannot be adjusted. Models operating
at 50 Hz are set at 83% and 60 Hz models are set at
• The equipment supplier checks that the device is still
operating correctly when the routine checks are performed
on the Mark 5 Nuvo 8.
IV.6. Technical characteristics
Dimensions: L x W x H: 394 x 396 x 706 mm (15.5 x 15.6
x 27.8 in.)
Caster diameter: 50 mm (2.0 in.).
Tilt angle (transport with humidi er tted): 70
Weight: 24 kg /54 lbs
Noise level < 53 dBA
Flow values:
Continuously Adjustable Flowmeter: 2 to 8 liters/minute.
(Some models may have other values.)
May 2011
85%.
o
.
5
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