•
Process fault
In the case of a process fault, a visible and au
-
dible alarm is activated (continuous red light or
lighted alarm and audible alarm).
• Oxygen Concentration
If the oxygen concentration level falls below the
required range the red light comes on and the
green light goes out. After a 15 minute delay
the audible alarm will sound.
5.4.2. Safety devices
•
Compressor motor
Thermal safety is ensured by a thermal switch
situated in the motor winding (145 ± 5
o
C).
•
Electrical protection
A 5 amp circuit breaker is incorporated into the
front cabinet of all models.
Class II devices with insulated casings (EN60601-
1 standard)
•
Safety valve
This is fitted on the compressor outlet and is
calibrated to 2.7 bar (40 psig).
5.4.3 Indicators
•
The green indicator light (Fig.5.1) indicates
that power is applied to the device. When
first turned on the indicator will flash until
correct oxygen concentration is achieved.
At that time the green indicator will remain
illuminated and the device is ready to provide
oxygen enriched air to the patient.
5.4.3 Indicators (continued)
•
The red indicator warns of a process fault.
One event that can cause the red indicator
to be illuminated is low oxygen concentra
-
tion. The low oxygen concentration red
indicator will light when oxygen concen
-
tration falls below a predetermined set
point. Another event that will cause the
red indicator to light is a blocked oxygen
flow. In this case the green indicator and
red indicator will be illuminated simulta
-
neously.
