Instructions for use Fabius plus SW 3.n 159
Troubleshooting
Failure of the O2 sensor
Causes for faulty calibration
The calibration was not successful if, after the
calibration of the O
2 sensor, the alarm message
O2 SENSOR FAIL ! is displayed.
Possible causes and remedial measures are
described in the following table.
Low O2 supply
If the pressure of the O2 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 O2 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 O2 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 O2 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 O2 sensor. Expose the new O2 sensor
to ambient air 15 minutes before calibration.
The O
2 sensor is not connected. Check the O2 sensor. Connect the O2 sensor cor-
rectly and recalibrate.
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