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DOTX-45 Dissolved Oxygen System Part 10– Troubleshooting

DOTX-45 62 -

MESSAGE

DESCRIPTION

POSSIBLE CORRECTION

D.O. Cal Fail

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.

TC Cal Fail

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. .

EPROM Fail

Internal nonvolatile memory failure

System failure, consult factory.

Chcksum Fail

Internal software storage error.

System failure, consult factory.

Display Fail

Internal display driver fail.

System failure, consult factory.

Range Cal Fail

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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