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Emerson Process Management GmbH & Co. OHG 7-17
Instruction Manual
HASAxE-IM-HS
05/2006
7 Maintenance
7-3-3 Advanced Calibration
After span calibration has finished, the instru-
ment closes the last open 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 SpanAll calibration procedure has finished
when the last time interval shows remaining
0 seconds and the gas flow is sample.
Press the HOME key to return to the measuring
screen.
The first screen appearing shows that a valve
(here: V1) 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).
When the prepurge time has elapsed, the
instrument starts to calculate the span value
(here indicated by the procedure term Span 1):
Span 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 V1
Procedure Span 1
Time 29 s
Gasflow V1
Procedure Purging
Time 10 s
Gasflow V2
Procedure Span 2
Time 29 s
Gasflow V2
Procedure Purging
Time 10 s
Gasflow Sample
CO2.1 0.000 ppm
Procedure Purging
Time 10 s
When channel 1 has finished spanning, the
same procedure is automatically started for the
second channel (if installed!): The next valve
(here: V2) opens to prepare spanning for
channel 2. Again the instrument shows Pur-
ging, followed by Span 2.