Teledyne 3000TA - General purpose trace oxygen analyzer User Manual

Page 62

5 Maintenance

Model 3000TA

5-8

Teledyne Analytical Instruments

5.7

Troubleshooting

Problem:

Erratic readings of the Oxygen concentration as reported by 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:

5.6

Cleaning

If instrument is unmounted at time of cleaning, disconnect the instru-

ment 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.