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Calibration
Calibration in Dual Range and Auto Range Mode
Calibrate Low NO
Calibrate Low NO
4-18
Model 42i Trace Level Instruction Manual
5. Press
to calculate and save the new low NO coefficient based on
the entered span concentration.
Use the following procedure to calibrate the NO
x
calibration gas.
1. Press
to return to the Calibration menu and choose Cal Lo NOx
Coefficient.
2. Verify that the low NO
low NO calibration gas concentration plus any known NO
The Lo NO
field displays the current NO
x
NO
Span Conc field is where you enter the low NO
x
concentration.
Use
to increment and decrement the numeric character at the cursor.
3. Press
to calculate and save the new low NO
the entered span concentration.
4. Press
to return to the Run screen.
Use the following procedure to calibrate the NO
2
calibration gas.
1. Adjust the O
3
produce a decrease in the low NO concentration equivalent to about
80% of the URL of the low NO
90% of the low NO concentration determined in the "Calibrate Low
NO
" procedure.
x
2. From the Main Menu choose Calibration > Cal Lo NO2 Coefficient.
The Lo NO
field displays the current NO
2
NO
Span Conc field is where you enter the Lo NO
2
concentration.
3. Set the low NO
NO
concentration generated by GPT and any NO
2
calibration gas concentration is the same as the
x
to move the cursor left and right and use
generator in the GPT system to generate sufficient O
range. The decrease must not exceed
2
calibration gas concentration to reflect the sum of the
2
channel to the NO
x
x
impurity.
2
concentration. The Lo
x
calibration gas
x
coefficient based on
x
channel to the NO
2
2
concentration. The Lo
2
calibration gas
2
impurity.
2
Thermo Fisher Scientific
to
3
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Troubleshooting
