Thermo Scientific 49i, Instruction Manual, Page: 150 / 314

Calibration
Internal Ozonator Adjustment (Option)
4-14 Model 49
i
Instruction Manual Thermo Fisher Scientific
4. Adjust Level 1 for the desired level (typically 80% URL).
5. Allow this value to stabilize.
6. Record the value as [O
3
]
80
to be used in the span error equation of Step
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
3
Level 2 .
9. Adjust Level 2 for the desired level (typically 90 ppb).
10. Allow this value to stabilize.
11. Record the value as [O
3
]
20
to be used in the following error equation:
where:
A
20
= Recorder response of Model 49 i with precision level, % scale
Z= Recorder response obtained at the last calibration for zero air, % scale
Note The expected stability of the analyzer section of the Model 49 i is
greater than the expected stability of the internal ozonator.
100
] [O
] [O ]
100
URL
Z) [(A
Error %
20 3
20 3 20
u
(8)