Operation
Calibration Factors Menu
Thermo Electron Corporation Model 48i Instruction Manual 3-21
In the example below, the analyzer is reading 15.80 ppm of CO while
sampling zero air. The CO background correction is 0.0 ppm. That is, the
analyzer is not applying a zero background correction. The question mark
is used as a prompt to change the background correction. In this case the
background correction must be increased to 15.80 ppm in order for the CO
reading to be at 0 ppm.
To set the CO reading in the example below to zero, use to
increment the CO background correction to 15.80 ppm. As the CO
background correction is increased, the CO concentration is decreased. At
this point, however, no real changes have been made. To escape this screen
without making any changes, press to return to the Calibration
Factors menu or to return to the Run screen. Press to actually
set the CO reading to 0 ppm and store the background correction of 15.80
ppm.
• In the Main Menu, choose Calibration Factors > CO
Bkg.
•Use and to increment or decrement the proposed
background value.
• Press to save the new background.
• Press to return to the Calibration Factors menu or to
return to the Run screen.
CO Span Coefficients The CO span coefficient is usually calculated by the instrument processor
during calibration. The span coefficients are used to correct the CO
readings and normally has a value near 1.000.
XXLO WCONCENTRATIONXXLO W
CO 15.8 PPM
SAMPLE 12:34 ALARMx
CO BACKGROUND:
CO: 15.8
SET BKG TO: 0.0 ?
©ª INC/DEC
SAVE VALUE
RANGE AVG DIAGS ALARM
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