Chapter 3 Operation
3-39
Sample/Reference Ratio
The Sample/Reference Ratio screen, shown below, displays the ratio of the
intensities of the light source through the sample (CO) side and reference (N
2
)
side of the correlation wheel. Normally, when zero air is being sampled, the
sample/reference ratio is between 1.14 and 1.18. A ratio outside of this range may
indicate that the correlation wheel is dirty or leaking gas.
To display the Sample/Reference Ratio screen:
From the Main Menu choose Diagnostics
From the Diagnostics menu choose Sample/Ref Ratio
To use the Sample/Reference Ratio screen:
This is a view only screen
Press
MENU
to return to the Diagnostics menu
Press
RUN
to return to the Run screen
Sample/Reference Ratio Screen
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