Thermo Scientific 49iQ, Instruction Manual

Page: 163 / 282

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. ▲