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IV.3. Operating principle
The compressor sends filtered ambient air to a rotary distri-
bution 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 to a pressure
reducing valve through the adjustable flow meter to the
oxygen outlet fitting.
During this time, the column which is being "regenerated" is
connected to the ambient air and flow 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 finally passes through a bacterial filter
located prior to the oxygen outlet fitting.
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/O (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).
IV.4.2. Safety devices
•
Compressor motor:
Thermal safety is ensured by a thermal switch situated in the
stator winding (145 ± 5
o
•
Ambient air valve:
In the case of a negative pressure in the molecular sieve
columns, this valve allows ambient air to enter.
•
Electrical protection of the MARK 5 Nuvo [M5C5]:
A 5A circuit breaker is incorporated into the front cabinet of all
230V models. A 10 A circuit breaker is included with 115V
models.
•
Safety valve:
This is fitted on the compressor outlet and is calibrated to 2.7
bar (40 psig).
•
Class II devices with insulated castings (EN60601-1
standard)
[ code
2010-2224CE Rev C ]
C).
IV.5. OCSI (oxygen concentration status indication
module) function
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 [M5C5] concentrator.
The Oxygen Monitor measures the concentration and
activates an audible and visual alarm if it falls below the
alarm set point percentage.
When the MARK 5 Nuvo [M5C5] is started, the indicator
lights operate as follows:
IV.5.2. Green indicator
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
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
85%.
at
• The equipment supplier checks that the device is still
operating correctly when the routine checks are performed
on the MARK 5 Nuvo [M5C5].
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: 38 mm (1.5 in.).
Tilt angle (transport with humidifier fitted): 70
Weight: 23-25 kg. (50 - 55 lbs)
Noise level < 47 dBA (to ISO 8359)
Flow values:
Continuously Adjustable Flowmeter: 0 to 5 liters/minute.
(Some models may have other values.)
Nov 2004
o
.
5
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