Thermo Scientific 49i Instruction Manual page 150

Calibration
Internal Ozonator Adjustment (Option)
4-14 Model 49i Instruction Manual
4. Adjust Level 1 for the desired level (typically 80% URL).
5. Allow this value to stabilize.
6. Record the value as [O
2 in the "Periodic Zero and Span Checks" section described previously.
Note Level 1 setting.
7. Press to return to the Instrument Controls menu.
8. From the Instrument Control menu choose O
9. Adjust Level 2 for the desired level (typically 90 ppb).
10. Allow this value to stabilize.
11. Record the value as [O
[(A
20
% Error
where:
A = Recorder response of Model 49i with precision level, % scale
20
Z= Recorder response obtained at the last calibration for zero air, % scale
Note The expected stability of the analyzer section of the Model 49i is
greater than the expected stability of the internal ozonator.
] to be used in the span error equation of Step
3 80
] to be used in the following error equation:
3 20
URL
Z) ] [O ]
3 20
100
100
[O ]
3 20
Level 2.
3
(8)
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