X-STREAM
Emerson Process Management GmbH & Co. OHG 7-15
Instruction Manual
HASAxE-IM-HS
05/2006
7 Maintenance
7-3-3 Advanced Calibration
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).
Note!
Dual channel instruments zeroing both
channels at a time, show "Zero 1" in the
procedure line while calibration is ongoing.
When calibration has finished, for a short
periode (about 1 to 2 seconds) the line shows
"Zero 2" to indicate the second channel has
been calibrated, too.
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).
The zero calibration procedure has finished
when the last time interval shows remaining
0 seconds and the gas flow is sample.
The first screen appearing shows that valve V4
is open. 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).
Gasflow V4
Procedure Purging
Time 10 s
Now press
either the LEFT key to return to the advanced
calibration menu to select another calibration
procedure
or the HOME key to return to the measuring
screen.
Gasflow V4
Procedure Zero 1
Time 29 s
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