Instructions for use Fabius plus SW 3.n
159
Troubleshooting
Failure of the O
2
sensor
Causes for faulty calibration
The calibration was not successful if, after the
calibration of the O
2
sensor, the alarm message
O
2
SENSOR FAIL !
is displayed.
Possible causes and remedial measures are
described in the following table.
Low O
2
supply
If the pressure of the O
2
gas supply falls below the
permissible minimum pressure of 20 psi (approx.
1.4 kPa x 100), an additional alarm
O
2
SUPPLY
LOW !!!
will be generated.
LED (A) starts flashing.
If the alarm occurs in the
Standby
mode and the
user switches to a ventilation mode, an acoustic
alarm signal will sound (continuous tone for
approx. seven seconds).
Cause
Remedy
During the calibration, the O
2
sensor was exposed
to an air mixture with extremely high or low oxygen
concentration.
Make sure that the O
2
sensor is exposed to ambi-
ent air during the entire calibration.
During the calibration, the O
2
sensor was exposed
to an air mixture with fluctuating oxygen concentra-
tion.
Make sure that the O
2
sensor is exposed to ambi-
ent air during the entire calibration.
The O
2
sensor was not exposed to ambient air long
enough before the calibration.
Expose the O
2
sensor to ambient air for 2 minutes.
When a new O
2
sensor is connected, expose the
new sensor to ambient air for 15 minutes.
The maximum period of use of the O
2
sensor has
elapsed.
Replace the O
2
sensor. Expose the new O
2
sensor
to ambient air 15 minutes before calibration.
The O
2
sensor is not connected.
Check the O
2
sensor. Connect the O
2
sensor cor-
rectly and recalibrate.
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