Emerson Rosemount Xstream Series Instruction Manual page 204

X-STREAM
Gasflow
Procedure
Time
Gasflow
Procedure
Time
Gasflow
Procedure
Time
Gasflow
Procedure
Time
Gasflow
CO2.1
Procedure
Time
7-20
7-3-3 Advanced Calibration
V1
Purging
10 s
V1
Span 1
29 s
V2
Purging
10 s
V2
Span 2
29 s
Sample
0.000 ppm
Purging
10 s
After zero calibration has finished, the instru-
ment closes the zero gas valve and opens the
next (here: V1). Currently the system is purged
(prepurge) to ensure it is properly filled with
span gas when span 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
for- calibration" (2 x 15 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.
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.
Emerson Process Management GmbH & Co. OHG
Instruction Manual
HASAxE-IM-HS
05/2006
90
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