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IV.3. Operating principle
The compressor sends filtered ambient 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 to a pressure
reducing valve through the adjustable flow valve 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 (fromthe 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, an intermittent audible
alarm is activated and the green light turns off. Test alarm by
actuatingthe I/O (On/Off) switch when the power cord is not
plugged into the wall outlet.
•
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 (if supplied with unit):
The Nuvo Lite Concentrator has a no flow alarm option.
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
motor winding (145 ± 5
•
Electrical protection of the MARK 5 Nuvo LITE:
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)
IV.5. OCSI (oxygen concentration status indication
module) function
2010-8401CE Rev B
o
C).
IV.5.1. Operating principle
The Oxygen Monitor (2) is an electronic module capable of
checking the effective oxygen concentration supplied by
the MARK 5 Nuvo LITE 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 LITE is started, the indicator lights
operate as follows:
IV.5.2. Green indicator
The green (LED) 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 (LED) indicator light is used to warn the patient of
a system fault. The event that can cause the red (LED)
indicator to be lighted is low oxygen concentration . The
low oxygen concentration red (LED) warning will light
when the oxygen concentration falls below a predetermined
set point. When the red (LED) warning light is on for 15
minutes (±2 minutes), a continuous audible alarm is activated.
A audible alarm will sound intermittently on loss of mains
power. 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 LITE.
IV.6. Technical characteristics
Dimensions: L x W x H: 36x23x58.5 cm (14 x 9 x 23 in.)
Caster diameter: 3.8 cm (1.5 in.).
Tilt angle (transport with humidifier fitted): 30
Weight: 13 kg. 30 lbs (depends on model)
Noise level 45 to < 40 dBA (depends on model)
Flow values:
12 position flow valve 0.125-5 liters/minute.
(Some models may have other values.)
Nov 2009
o
.
5
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