Teledyne 3000TB - Bulkhead mount trace oxygen analyzer - Manual (Page 71)

Trace Oxygen Analyzer Maintenance 5
5-9
Teledyne Analytical Instruments
5.6 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:
Table 5-1: Self Test Failure Codes
Power
0 OK
1 5 V Failure
2 15 V Failure
3 Both Failed
Analog
0 OK
1 DAC A (0–1 V Concentration)
2 DAC B (0–1 V Range ID)
3 Both Failed
Preamp
0 OK
1 Zero too high
2 Amplifier output doesn't match test input
3 Both Failed