May 2011
2010-2224F Rev C
5
IV.3. Operating Principle
The compressor sends ltered room air to a rotary distribution
valve, which allows compressed air to pass to the column in
production. The columns contain a molecular sieve that func-
tion 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 oxy-
gen 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 Alarm
•
No voltage detection:
In the event of a loss of mains power, a continuous audible
alarm is activated. Test alarm by activating
I/0 [On/Off]
switch with power cable unplugged from wall receptable.
•
Process fault
:
In the case of a process fault, a visible and audible alarm is ac-
tivated (continuous red light 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
C).
•
Ambient air valve:
In the case of a negative pressure in the molecular sieve co-
lumns, 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.
• Class II devices with insulated casings (EN60601-1
standard).
•
Safety valve
:
This is tted on the compressor outlet and is calibrated to
2.7 bar (40 psig).
IV. 5.3. Maintenance of the system alarms:
• No special maintenance is required.
• The equipment supplier checks that the unit 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 humidi er tted): 70
o
.
Weight: 25-28 kg. (50 - 55 lbs -varies with model)
Noise level: < 48 dBA
Flow values:
Continuously Adjustable Flowmeter: 0 to 5 liters/minute.
(Some models may have other values)
Accuracy of ow supplied:
The ow supplied is equal to the ow set on the owmeter,
accurate to within ± 10 % or 200 ml/min, whichever is the
larger of the two.
Average oxygen content:
• at 2 l/min: 93%.
• at 4 l/min: 93%.
• at 5 l/min: 90%.
(Values at 21
o
C and at one atmosphere pressure).
Max. recommended ow: 5 l/min.
The variation of the maximum recommended ow does not
exceed ± 10 % of the indicated value when a back pressure
of 7 kPa (1 psig) is applied to the output of the device. The
maximum outlet pressure is 50 kPa (7 psig).
\
IV. 5. Indicator Light Function
IV. 5.1 Green Indicator
The green indicator light indicates that power is applied to
the concentrator and that it is ready to provide oxygen enri-
ched air to the patient. To be lighted, it is necessary that the
concentrator power plug be inserted into the wall receptacle
and that the ON/OFF (
I/0
) switch be actuated.
IV. 5.2 Red Indicator
The red indicator light is utilized to warn the patient of a
system fault. The two events that can cause the red indicator
to be lighted are abnormal system pressure and loss of mains
power. The abnormal system pressure warning will light
when product pressure falls below approximately 4 psig or
above approximately 18 psig. The loss of power indicator
will light when mains power is interrupted or the power cord
is not plugged into the wall receptacle.
