TSI Instruments CERTIFIER FA - Page 35

4:Troubleshooting 27
Table 4. Troubleshooting the Certifier
®
FA Test System (cont.)
Symptom
Possible Cause
Corrective Action
Oxygen sensor
calibration takes
longer than 5
minutes.
21% oxygen and/or
100% oxygen not
supplied for
calibration.
Flow of 100%
oxygen is too low.
Verify that calibration
gases are 21% oxygen
and 100% oxygen and
repeat calibration.
Increase flow of 100%
oxygen to at least
5 SLPM and repeat
calibration.
Oxygen sensor
calibration fails.
21% oxygen and/or
100% oxygen not
supplied for
calibration.
Oxygen sensor is
expired.
Verify that calibration
gases are 21% oxygen
and 100% oxygen and
repeat calibration.
Replace oxygen
sensor.