Dräger Perseus A500 Instructions For Use Manual page 206

Troubleshooting
Priority Alarm
!! 10 Minute volume low
! 220 N O cylinder almost empty The cylinder is almost empty. Replace the cylinder. Use the
2
! 255 N O cylinder empty
2
! 190 N O cylinder sensor?
2
!! 150 N O FG flow measurem.
2
failed
! 255 N O measurement failed
2
! 255 N O measurement not
2
available
206
Cause
The minute volume is below
the lower alarm limit.
Leakage or disconnection.
Flow measurement is inaccu-
rate.
The cylinder is empty or
closed.
Cylinder pressure sensor is
not connected.
The measurement system for
the N O fresh-gas flow has
2
failed.
There is electromagnetic
interference.
There is an internal failure.
The ambient air used for cali-
brating the sensor was
impure.
There is electromagnetic
interference.
Ambient temperature is too
high.
Instructions for use Perseus A500 SW 2.0n
Remedy
Check patient condition.
Check tube or mask.
Check ventilation settings.
Check alarm limit.
Check the breathing circuit for
tight connections and leak-
ages.
Replace the expiratory flow
sensor. Perform the leakage
test.
central supply.
Replace the cylinder. Use the
central supply.
Check if cylinder pressure
sensor is connected.
Use "ALARM RESET" to
acknowledge alarm.
Only use O as fresh gas.
2
Use the total flow tube to
check the fresh-gas flow.
Adjust the fresh-gas flow so
that it equals or exceeds the
minute volume.
Check for electromagnetic
radiation in the vicinity.
Use an alternative gas mea-
surement system.
If the problem persists, call
DrägerService.
Position the device in an envi-
ronment with clean ambient
air.
Wait for the automatic calibra-
tion.
Check for electromagnetic
radiation in the vicinity.
Check ambient conditions.