Advertisement
Operation
Calibration Factors Menu
SO
Background
2
3-16
Model 43i Trace Level-Enhanced Instruction Manual
CALIBRATION FACTORS:
>SO2 BKG
SO2 COEF
RESET USER CAL DEFAULTS
RANGE
AVG
DIAGS ALARM
The SO
SO
background is the amount of signal read by the analyzer while
2
sampling zero air. Although the background is expressed in terms of
concentration, the background signal is actually the combination of
electrical noise and scattered light. Before the analyzer sets the SO
to zero, it stores this value as the SO
The SO
instruments zero background. As such, the instrument should sample zero
air until stable readings are obtained. The display shows the current SO
reading. This reading is the SO
display shows the SO
is being used to correct the SO
correction is subtracted from the SO
In the example that follows, the analyzer is reading 1.49 ppb of SO
sampling zero air. The SO
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 1.49 ppb in order for the SO
reading to be at 0 ppb.
To set the SO
increment the SO
background correction is increased, the SO
this point, however, no real changes have been made. To escape this screen
without saving any changes, press
Factors menu or
set the SO
1.49 ppb.
In the Main Menu, choose Calibration Factors > SO
0.00
1.000
Background correction is determined during zero calibration. The
2
Background screen is used to perform a manual adjustment of the
2
background correction that is stored in memory and
2
background correction is 0.0 ppb. That is, the
2
reading in the example that follows to zero, use
2
background correction to 1.49 ppb. As the SO
2
to return to the Run screen. Press
reading to 0 ppb and store the new background correction of
2
CALIBRATION FACTORS:
>SO2 BKG
HI SO2 COEF
LO SO2 COEF
RESET USER CAL DEFAULTS
RANGE
AVG
DIAGS ALARM
background correction.
2
background signal. The next line of the
2
reading. That is, the SO
2
reading.
2
concentration is decreased. At
2
to return to the Calibration
2
1.49
1.000
1.000
reading
2
2
background
2
while
2
2
to
2
to actually
Bkg.
Thermo Fisher Scientific
Advertisement
Troubleshooting
