
DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting
DOTX-45 62 -
Failure of oxygen calibration. FAIL icon will
not extinguish until successful calibration
has been performed, or 30 minutes passes
with no keys being pressed.
Clean sensor redo zero and span calibration.
If still failure, sensor slope may be less than
20% or greater than 500%. Perform sensor
tes
ts as described in section 10.4. Replace
sensor if still failure.
Failure of temperature calibration. FAIL icon
will not extinguish until successful
calibration has been performed, or 30
minutes passes with no keys being
pressed.
Clean sen
sor, check cal solution temperature
and repeat sensor temp calibration. TC
calibration function only allows adjustments
of +/- 6 º
C. If still failure, perform sensor
tests as described in section 10.4. Replace
sensor if still failure. .
Internal nonvolatile memory failure
System failure, consult factory.
Internal software storage error.
System failure, consult factory.
Internal display driver fail.
System failure, consult factory.
Failure of factory temperature calibration.
Consult factory.
Figure 10-1 Display Messages (continued)
10.4 Sensor
Tests 1. Check the membrane condition. A membrane that is not
stretched smoothly across the tip of the sensor will cause
unstable measurements. If necessary, change membrane and
electrolyte.
2. Dissolved oxygen sensors can be tested with a digital voltmeter
(DVM) to determine if a major sensor problem exists. Follow
the steps below to verify sensor integrity:
A. Prior to disconnecting the sensor, measure the sensor
output voltage at the analyzer terminal strip with a DVM
while the sensor is hanging in air. If the sensor has been
connected to a powered analyzer for at least 12 hours,
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