Table 3-1 Troubleshooting - Teledyne AX300 Operating/Service Instructions Manual

Portable Oxygen Analyzer

Table 3-1 Troubleshooting

Symptom
New sensor responds
slow or drifts.
Sensor will not read be-
low 22 % after calibration
in 100% O2.
The sensor does not
react to changes in
oxygen concentration,
or the readings are un-
stable and drifting.
The display is flashing
√ SENSOR
Teledyne Analytical Instruments
Why
If the sensor is new
and was just removed
from its sealed bag it
may need to run for
several hours.
Calibration in 100%
was invalid or the
room air enriched with
excess oxygen.
Water may have con-
densed on the sens-
ing surface.
Electrical interference
is disrupting the elec-
tronics
The unit has detected
a fault in the signal
from the sensor.
Sensor has expired.
The sensor has been
exposed to a gas con-
taining less than 18%
Service Instructions
What To Do
A) Wait 1–2 hours and recali-
brate.
A) Recalibrate using dry gas
B) Make sure that at least 6"
(30 cm.) of tubing is attached
to the exhaust side of the tee
adapter to prevent back fill-
ing. O2 flow rate should not
exceed 5 l/min.
C) Oxygen concentration at the
sensor is significantly higher
than 21%. Take the analyz-
er to a well-ventilated area
and check the reading
again.
D) Try calibrating with a known
good sensor, and if this fails,
contact customer support.
A) Remove the sensor from tee
adapter and unscrew the plas-
tic flow diverter. Using absor-
bent tissue or cotton swab,
gently wipe off sensing sur-
face inside threaded portion of
sensor assembly. Do not
damage the sensing surface,
and do not leave any tis-
sue/swab residue on the
sensing membrane.
B) Relocate unit away from
sources of electrical noise
such as cauterizing equipment
and two-way radios.
A) Check sensor cable con-
nections to ensure they are
completely inserted into the
mating connector and the
capture nut is firmly in
place.
B) Expose the sensor in 100%
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