Teledyne 3000TB-XL - Trace oxygen analyzer - Manual (Page 61)

Trace Oxygen Analyzer Operation 4
4-21 Teledyne Analytical Instruments
4.7 The Analyze Function
This is the normal operating mode of the analyzer. In this Mode the
analyzer is monitoring the sample, measuring and displaying the amount of
oxygen, and reporting alarm conditions.
Normally, all of the functions automatically switch back to the Analyze
function when they have completed their assigned operations. Pressing the
Escape button in many cases also switches the analyzer back to the Ana-
lyze function. Alternatively, you can press the Analyze button at any time
to return to analyzing your sample.
IMPORTANT: In the event of loss of flow through the analyzer, if the
vent is vented to a location of high oxygen content,
oxygen will back diffuse through the vent line and in
most cases quickly saturate the cell with oxygen which
can then require a quite long purge down time for the
sensor when then exposed to low oxygen concentra-
tions. In the event that flow is to be interrupted into the
analyzer, it is suggested that the user do one of the
following:
1. Bag the sensor in nitrogen during this time
2. Install a shut off valve on the vent port of the ana-
lyzer or somewhere within the users sample system.