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11. Record the NO
concentration and the analyzer's NO
2
12. Maintaining the same F
obtain several other concentrations of NO
five evenly spaced points across the remaining scale are suggested).
13. Record the stable responses and plot the analyzer's NO
versus the corresponding calculated (using the above equation for
[NO
]
) concentrations and draw or calculate the NO
2
OUT
curve.
Note It is important that the curve be linear within
range. If the curve is nonlinear, the analyzer is not operating correctly,
(possible leak, or converter failure, etc.), and should be serviced. Assuming
the curve is linear, subsequent data should be reduced using this NO
calibration curve response.
Note The user can also manually change the calibration factors. This is
often useful in a troubleshooting situation. From the Home screen, choose
Calibration>Advanced Calibration>Manual Calibration>Adjust Span
Coefficients.
However, after the above calibration procedure is completed, all subsequent
data reduction depends on the calibration parameters remaining the same
as during the initial calibration. Therefore, never change any calibration
factor without first recording the value so that after any troubleshooting
procedure is completed, the initial value can be re-entered thereby not
altering the multipoint calibration.
, F
, and F
, adjust the ozone generator to
NO
O
D
over the NO
2
▲
▲
Calibration
Calibration
response.
2
range (at least
2
responses
2
calibration
2
1% FS over the NO
2
2
42iQHL Instruction Manual
4-15
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