Teledyne 3000MA - Paramagnetic oxygen analyzer User Manual

Page 52

5 Maintenance

Model 3000MA

5-4

Teledyne Analytical Instruments

5.5

Cleaning

If instrument is unmounted at time of cleaning, disconnect the instrument from the

power source. Close and latch the front-panel access door. Clean outside surfaces with a
soft cloth dampened slightly with plain clean water. Do not use any harsh solvents such
as paint thinner or benzene.

For panel-mounted instruments, clean the front panel as prescribed in the above

paragraph. DO NOT wipe front panel while the instrument is controlling your process.

5.6

Troubleshooting

Problem:

Erratic readings of the Oxygen concentration as reported by the analyzer.

Possible Cause:

The gas flow is too high.

Solution:

Reduce the gas pressure to the analyzer.

Possible Cause:

The analyzer may have been calibrated in an inaccurate fashion.

Solution:

Turn the analyzer off, then back on again. Press the System key when prompted by the
analyzer "Press System for default Values". This will return the analyzer to its default
settings in calibration and zero values. If erratic behavior continues replace the sensor.

Possible Cause:

Atmospheric Oxygen may be diffusing in through the vent and affecting the oxygen
level which the sensor sees.

Solution:

Increase flow rate and/or length or vent tubing in order to dilute of minimize the diffusion
of oxygen from the vent back to the sensor.

Problem:

Inaccurate zero operation (i.e. the user has zeroed the analyzer accidentally on gas much
higher than one would normally use for a zero gas).

Solution: