Thermo Scientific 42i Instruction Manual page 144

Calibration
Calibration
Calibrate the NO Channel to the
x
NO Calibration Gas
x
4-12 Model 42i Instruction Manual
The NO line of the Calibrate NO screen displays the current NO
concentration. The SPAN CONC line of the display is where you enter
the 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 NO coefficient based on the
entered span concentration.
The NO recorder response will equal:
Recorder R esponse
Where:
URL = Nominal upper range limit of the NO channel, ppm
4. Record the [NO]
OUT
indicated by the recorder response.
Use the following procedure to calibrate the NO
calibration gas.
1. Press to return to the Calibration menu, and choose Cal NOx
Coefficient.
2. Verify that the NO
NO calibration gas concentration plus any known NO
The NO line of the Calibrate NO
x
concentration. The SPAN CONC line of the display is where you enter
the NO calibration gas concentration.
x
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 NO
entered span concentration.
4. Press to return to the Run screen. The exact NO
is calculated from:
[NO
(% scale) =
URL
concentration and the analyzer NO response as
calibration gas concentration is the same as the
x
screen displays the current NO
x
]
OUT
x 100 +
Z
NO
channel to the NO
x
impurity.
2
coefficient based on the
x
concentration
x
Thermo Fisher Scientific
x
x