Iv.3. Operating Principles; Iv.4. Alarms - Safety Devices; Iv.5. Indicator Light Function; Iv.6. Technical Characteristics - Nidek Medical Lite User Manual

IV.3. Operating principle
The compressor sends  ltered room air to a solenoid valve,
which allows compressed air to pass to the column in produc-
tion. 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 valve to the
oxygen product 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  nal product  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, an intermittent 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.
• 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  ow alarm (if supplied with the unit):
•
The Nuvo Lite concentrator has a no  ow alarm option.
This device provides a continuous audible alarm in the
event the oxygen  ow to the patient becomes blocked.
IV.4.2. Safety devices
• Compressor motor:
Thermal safety is ensured by a thermal switch situated in the
o
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.
Class II devices with insulated castings (EN60601-1
standard)
• Safety valve:
This is  tted on the compressor outlet and is calibrated to
2.7 bar (40 psig).
2010-8401CE Rev C
C).
IV. 5. OCSI (oxygen concentration status indication mo-
dule) function
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 activa-
tes 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. An 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 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 humidi er  tted): 30
Weight: 15 kg. 33 lbs (depends on model)
Noise level 45 to < 40 dBA (depends on model)
Flow values:
12 position  ow valve 0.125-5 liters/minute.
(Some models may have other values.)
May 2011
85%.
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