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Operation
Calibration Factors Menu
NO, NO
2
Coefficients
3-18
Model 42i Trace Level Instruction Manual
NO reading to be at 0 ppb, i.e., a NO reading of 0.09 ppb minus a NO
background reading of 0.09 ppb gives the corrected NO reading of 0 ppb.
To set the NO reading in the example below to zero, use
increment the NO background correction to 0.09 ppb. As the NO
background correction is increased, the NO concentration is decreased.
Note that at this point, pressing
on the analog outputs or the stored NO background correction of 0.0 ppb.
A question mark following both the NO reading and the NO background
correction indicates that these are proposed changes as opposed to
implemented changes. To escape this screen without saving any changes,
press
to the Run screen. Press
store the new background correction of 0.09 ppb. Then the question mark
prompt beside the NO reading disappears.
In the Main Menu, choose Calibration Factors > NO, NOx, or
●
Prereactor Bkg.
, and NO
The NO, NO
x
instrument processor during calibration. The span coefficients are used to
correct the NO, NO
coefficients normally has a value near 1.000. The NO
normally has a value between 0.95 and 1.050.
The NO, NO
NO
span coefficients to be manually changed while sampling span gas of
x
known concentration. The NO, NO
the same way. Therefore, the following description of the NO coefficient
screen applies to the NO
The display shows the current NO concentration reading. The next line of
the display shows the NO span coefficient that is stored in memory and is
being used to correct the NO concentration. Notice that as the span
coefficient value is changed, the current NO concentration reading on the
above line also changes. However, no real changes are made to the value
to return to the Calibration Factors menu or
NO BACKGROUND:
NO:
SET BKG TO:
RANGE
AVG
DIAGS ALARM
, and NO
span coefficient are usually calculated by the
2
x
, and NO
2
, and NO
Coefficient screens allow the NO, NO
2
x
, and NO
2
and
however, has no affect
to actually set the NO reading to 0 ppb and
0.09
0.00
INC/DEC
SAVE VALUE
readings. The NO and NO
x
2
, and NO
Coefficient screens operate
2
x
coefficient screens as well.
x
to
to return
span
x
span coefficient
, and
2
Thermo Fisher Scientific
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