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Emerson Process Management GmbH & Co. OHG 7-25
Instruction Manual
HASAxE-IM-HS
05/2006
7 Maintenance
7-3-4 Auto Calibration
Gasflow ZeroGas
CO2.1 0.000 ppm
Procedure Zero 1
Time 29 s
When the prepurge time has elapsed, the
instrument starts to calculate the zero point
(here indicated by the procedure term Zero 1):
Zero gas is still applied, the time count down
starts at a value corresponding to 2 times "t
90
-
for- calibration" (2 x 15 s).
Gasflow Sample
CO2.1 0.000 ppm
Procedure Purging
Time 10 s
After zero calibration has finished, the instru-
ment closes the zero gas valve and opens the
sample gas valve. Now a postpurge procedure
starts to indicate that proper sample gas mea-
surement values require the system to be filled
with the related gas only. Postpurge time again
is the purge time entered in the calibration
setup screen (see page 7-6).
Gasflow ZeroGas
CO2.1 0.000 ppm
Procedure Purging
Time 10 s
After having started a zero calibration watch
the screen for status information (explained
by means of the left hand exemplary pictures):
The first screen appearing shows that zero gas
is flowing to calibrate the CO2 channel (here:
the instrument's 1st channel indicated by the
succeeding ".1"). Currently the system is
purged (prepurge) to ensure it is properly filled
with zero gas when zero calculation is started.
The remaining purge time is 10 seconds
(decreasing from the value entered in the
calibration setup screen, see page 7-6).
The zero calibration procedure has finished
when the last time interval shows remaining
0 seconds and the gas flow is sample.