Calibration
Calibration in Dual Range and Auto Range Mode
Thermo Electron Corporation Model 42i Low Source Instruction Manual 4-13
5. Press to set the NO background to zero.
6. Press to return to the Run screen.
7. Repeat Steps 3 through 6, selecting Calibrate NOx Background to set
the NO
x
background to zero.
Calibrate Low NO Use the following procedure to calibrate NO channel to the NO calibration
gas.
1. Disconnect the source of zero air from the SAMPLE bulkhead. In its
place, connect a source of NO calibration gas of about 80% of the low
NO full-scale range.
2. Allow the analyzer to sample the low NO calibration gas until the NO,
NO
2
, and NO
x
readings stabilize.
3. When the responses are stabile, from the Main Menu choose
Calibration > Calibrate Lo RNG NO.
4. The Lo NO field displays the current NO concentration.
The Lo NO Span Conc field is where you enter the low NO calibration
gas concentration.
Use to move the cursor left and right and use
to increment and decrement the numeric character at the cursor.
5. Press to calculate and save the new low NO coefficient based on
the entered span concentration.
Calibrate Low NO
x
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 Calibrate
Lo RNG NO
x
.
To Next Page
Loading...
