•
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).
•
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) indi
-
cates 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 concentration. The low oxy
-
gen concentration red indicator will
light when oxygen concentration 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
simultaneously.
