Teledyne 3000TA-EU - General purpose trace oxygen analyzer - Manual (Page 77)

Trace Oxygen Analyzer Maintenance
Teledyne Analytical Instruments
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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 or mini-
mize 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:
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.
Now proceed to carefully calibrate and zero the analyzer.