Calibration
Calibration in Dual Range and Auto Range Mode
Thermo Electron Corporation Model 42i Low Source Instruction Manual 4-15
Calibrate High NO 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 > Calibrate Hi RNG NO.
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.
Calibrate High NO
x
Use the following procedure to calibrate the NOx channel to the NOx
calibration gas.
1. Press to return to the Calibration menu, and choose Calibrate
HI RNG NO
x
.
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.
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