Operation
Calibration Factors Menu
3-20 Model 42i Low Source Instruction Manual Thermo Electron Corporation
In the example below, the analyzer is displaying 4.4 ppb of NO while
sampling zero air. A background correction of 0.0 ppb means that 0 ppb is
being subtracted from the NO concentration being displayed. Therefore,
the background correction must be increased to 4.4 ppb in order for the
NO reading to be at 0 ppb, i.e., a NO reading of 4.4 ppb minus a NO
background reading of 4.4 ppb gives the corrected NO reading of 0 ppb.
To set the NO reading in the example below to zero, use to
increment the NO background correction to 4.4 ppb. As the NO
background correction is increased, the NO concentration is decreased.
Note that at this point, pressing and however, has no affect 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 return to the Calibration Factors menu or to return
to the Run screen. Press to actually set the NO reading to 0 ppb and
store the new background correction of 4.4 ppb. Then the question mark
prompt beside the NO reading disappears.
• In the Main Menu, choose Calibration Factors > NO or NO
x
Background.
•Use and to increment or decrement the proposed
background value.
• Press to save the new background.
NO BACKGROUND:
NO: 4.4
SET BKG TO: 0.0
©ª
INC/DEC
SAVE VALUE
RANGE AVG DIAGS ALARM
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