Thermo Scientific 42i Instruction Manual page 147

Thermo Fisher Scientific
NO analog output will reflect the NO
2
GPT, any NO impurity, and the NO
2
The recorder response will be as follows:
Recorder R esponse
Where:
URL = Nominal upper range limit of the NO
12. Record the NO concentration and the analyzer's NO
2
13. Maintaining the same F
obtain several other concentrations of NO
five evenly spaced points across the remaining scale are suggested).
14. 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.
Using the Calibration Factors menu can change the calibration factors.
This is often useful in a troubleshooting situation. 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.
concentration generated by
2
zero offset.
2
[ ]
NO
2
OUT
(% scale) =
URL
channel, ppm
2
, F , and F , adjust the ozone generator to
NO O D
over the NO
2
▲
Model 42i Instruction Manual
Calibration
Calibration
x 100 +
Z
NO
2
response.
2
range (at least
2
responses
2
calibration
2

1% FS over the NO
2
2
▲
4-15