November 2013
2010-2324CE Rev A
5
IV.3. Operating principle
The compressor sends filtered 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 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.5. ALARMS INDICATORS
IV5.1. OCSI (
oxygen concentration status indicator)
if
equipped
The oxygen monitor (6) is an electronic module capable of
checking the effective oxygen concentration supplied by the
Mark 5 Nuvo MB
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 MB
is started, the indicator lights
operates 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 (OCSI equipped
). On initioal power up it will flash green until the unit has
reached normal operating conditions.
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.) (Nuvo 10 H: 760mm (29.8))
Caster diameter: 50 mm (2.0 in.).
Tilt angle (transport with humidifier fitted): 70
o
.
Weight: 24 kg /54 lbs
Noise level within ISO 8359 guidelines
Flow values:
Continuously Adjustable Flowmeter: 1 to 5, 2 to 8, or 2 to
10 (depending on model)
IV.5.3. Red indicator
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. All OCSI
models are set at 84%.
• The equipment supplier checks that the device is still
operating correctly when the routine checks are performed
on the
Mark 5 Nuvo MB
.
IV.4. Alarms - Safety devices
IV.4.1. Alarms
•
No voltage detection:
In the event of a loss of mains power, a intermittent 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 MB 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
stator winding (145 ± 5
o
C).
•
Electrical protection
of the
Mark 5 Nuvo MB:
A 5A circuit breaker is incorporated into the front cabinet of all
230V models, except NUVO 10 which is 10A. A 10 A circuit
breaker is included with 115V models.
• Class II devices with insulated castings (EN60601-1
standard)
•
Safety valve:
This is fitted on the compressor outlet and is calibrated to 3.4
bar (50 psig).
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 or abnormal pressures.
For OCSI units 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.
