Calibration
Calibration in Dual Range and Auto Range Mode
Thermo Scientific
42iQHL Instruction Manual
4-19
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 New 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 New 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.
Use the following procedure to calibrate the NO
2
channel to the NO
2
calibration gas.
1.
Adjust the O
3
generator in the GPT system to generate sufficient O
3
to
produce a decrease in the high NO concentration equivalent to about
80% of the URL of the high NO
2
range. The decrease must not exceed
90% of the high NO concentration determined in the “
Calibrate NOx
High
” procedure.
Calibrate NO
x
High
Calibrate NO
2
High
Содержание 42iQHL
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