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Calibration
Calibration in Dual Range and Auto Range Mode
4-16
42iQD Instruction Manual
Thermo Scientific
5.
In the Calibrate Backgrounds screen, press
Calibrate
to set the NO
x
reading to zero and to save the new background.
Use the following procedure to calibrate the NO
x
channel to the NO
x
calibration gas.
1.
Press the Back button to return to the Calibration menu and choose
Calibrate Low Range NO
x
Span Coefficient
.
The user sets the span concentration by pressing the Edit Span
Concentration button. The Calculated Low Range NO
x
Span
Coefficient button will show what the span coefficient will be set to if
the Calibrate button is pressed.
2.
Verify that the low NO
x
calibration gas concentration is the same as the
low NO calibration gas concentration plus any known NO
2
impurity.
3.
Enter the NO
x
calibration gas concentration using the pushbuttons,
and then press
Calibrate
to calculate and save the new low range NO
x
span coefficient based on the entered span coefficient.
Use the following procedure to calibrate the NO
x
channel to the NO
x
calibration gas.
1.
Press the Back button to return to the Calibration menu and choose
Calibrate High Range NO
x
Span Coefficient
.
The user sets the span concentration by pressing the Edit Span
Concentration button. The Calculated High Range NO
x
Span
Coefficient button will show what the span coefficient will be set to if
the Calibrate button is pressed.
2.
Verify that the high NO
x
calibration gas concentration is the same as
the high NO calibration gas concentration plus any known NO
2
impurity.
3.
Enter the NO
x
calibration gas concentration using the pushbuttons,
and then press
Calibrate
to calculate and save the new high range NO
x
span coefficient based on the entered span coefficient.
Calibrate NO
x
Low
Calibrate NO
x
High
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