Calibration
Internal Ozonator Adjustment
Thermo Scientific
49iQ Instruction Manual
4-15
4.
Allow this value to stabilize.
5.
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.
6.
Adjust Level 2 for the desired level (typically 90 ppb).
7.
Allow this value to stabilize.
8.
Record the Level 2 value as [O
3
]
20
to be used in the following error
equation:
100
]
[O
]
[O
]
100
URL
Z)
[(A
Error
%
20
3
20
3
20
Where:
A
20
= Recorder response with precision level, % scale
Z = Recorder response with zero air, % scale
URL = Upper range limit
Note
The expected stability of the instrument section is greater then the
expected stability of the internal ozonator.
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