TSI Incorporated Certifier FA Plus - Page 49

3: Troubleshooting 39
Symptom
Possible Cause
Corrective Action
Oxygen sensor
calibration fails.
21% oxygen and/or 100%
oxygen not supplied for
calibration.
Oxygen sensor is
expired.
Non-steady flow or tidal
flows used.
Verify that calibration gases are
21% oxygen and 100% oxygen
and repeat calibration.
Replace oxygen sensor.
Use constant flow rates to
supply calibration gas.
Pressure trigger gives
erroneous results.
Pressure signal supplied
to high-flow module not
correct.
Change source of pressure
signal.
Pressure trigger optimized for
use with high-frequency
ventilators.
Host computer not
able to view internal
memory or SD flash
memory.
Certifier test system was
not restarted after
selecting mass storage
target location.
Turn Certifier off and then on
again.