Calibration
Calibration in Dual Range and Auto Range Mode
Thermo Fisher Scientific
Model 42
i
Trace Level Instruction Manual
4-19
Use
to move the cursor left and right and use
to increment and decrement the numeric character at the cursor.
4.
Press
to calculate and save the new low NO
2
coefficient based on
the entered span concentration.
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 have stabilized, from the Main Menu, choose
Calibration >
Cal Hi NO Coefficient
.
The Hi NO field displays the current NO concentration. The Hi NO
Span Conc field is where you enter the high NO calibration gas
concentration.
Use
to move the cursor left and right and use
to increment and decrement the numeric character at the cursor.
3.
Press
to calculate and save the new high NO coefficient based on
the entered span concentration.
Use the following procedure to calibrate the NO
x
channel to the NO
x
calibration gas.
1.
Press
to return to the Calibration menu, and choose
Cal Hi
NOx Coefficient
.
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.
Use
to move the cursor left and right and use
to increment and decrement the numeric character at the cursor.
3.
Press
to calculate and save the new high NO
x
coefficient based
on the entered span concentration.
4.
Press
to return to the Run screen.
Calibrate High NO
Calibrate High NO
x
