Thermo Scientific 42i Instruction Manual page 149

Calibrate Low NO
Calibrate Low NO
Thermo Fisher Scientific
3. When the responses stabilize, from the Main Menu choose Calibration
> Calibrate NO Background.
4. The Set NO Background screen displays the current NO background
and NO concentration.
5. Press to set the NO background to zero.
6. Press to return to the Run screen.
7. Repeat Steps 3 through 6, selecting Cal NOx Background to set the
NO backgrounds to zero.
x
Use the following procedure to calibrate NO channel to the NO
calibration gas.
1. Disconnect the source of zero air from the SAMPLE bulkhead. In its
place, connect a source of NO calibration gas of about 80% of the low
NO full-scale range.
2. Allow the analyzer to sample the low NO calibration gas until the NO,
NO , and NO
2
3. When the responses are stabile, from the Main Menu choose
Calibration > Cal Lo NO Coefficient.
4. The Lo NO field displays the current NO concentration.
The Lo NO Span Conc field is where you enter the low NO calibration
gas concentration.
Use
to increment and decrement the numeric character at the cursor.
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.
readings stabilize.
x
to move the cursor left and right and use
Calibration in Dual Range and Auto Range Mode
channel to the NO
x
Model 42i Instruction Manual
Calibration
x
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