Calibration
Calibration in Dual Range and Auto Range Mode
4-20
42iQ Instruction Manual
Thermo Scientific
The user sets the span concentration by pressing the Edit Span
Concentration button. The Calculated Low Range NO
2
Span
Coefficient button will show what the span coefficient will be set to if
the Calibrate button is pressed.
3.
Set the low NO
2
calibration gas concentration to reflect the sum of the
NO
2
concentration generated by GPT and any NO
2
impurity using the
pushbuttons, and then press
Calibrate
to calculate and save the new
low range NO
2
span coefficient based on the entered span coefficient.
Use the following procedure to calibrate the NO channel to the NO
calibration gas.
1.
Connect a source of high NO calibration gas of about 80% of the high
NO full-scale range. Allow the analyzer to sample the high NO
calibration gas until the NO, NO
2
, and NO
x
readings have stabilized.
2.
After the responses stabilize, from the Home screen, choose
Calibration>Calibrate Span Coefficients>Calibrate High Range NO
Span Coefficient
.
The user sets the span concentration by pressing the Edit Span
Concentration button. The Calculated High Range NO Span
Coefficient button will show what the span coefficient will be set to if
the Calibrate button is pressed.
3.
Enter the NO calibration gas concentration using the pushbuttons, and
then press
Calibrate
to calculate and save the new high range NO 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.
Calibrate NO High
Calibrate NO
x
High
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