ABB ACF5000 Manual page 79

Parameter
AAC cycle runs
split The AAC runs step by step; the AAC step interval is waited for between the
complete The AAC runs continuously without FTIR reference and O
complete
& reference
Cycle time
Next AAC date/time
Number of AAC steps
Next AAC step
AAC step interval
Purge time
Meas->zero gas,
Zero->meas. gas
Gas path
Cancel management
ACF5000 FTIR ANALYZER SYSTEM
Explanation
The run mode of the AAC must be set.
individual steps. Each step takes approx. 18 minutes – with the purge time
set to 240 seconds. The cycle consists of a maximum of 6 steps – depending
on the number of installed sample components: 1. FTIR reference recording
and O span adjustment, 2. Measurement AAC measurement medium 1, and
2
so on until 6. Measurement AAC measurement medium 5. Set values and
actual values of the FTIR reference and the O
first step. Set values and actual values of the FTIR span values are output
after the last step.
The complete sequence takes max. 45 minutes: Purging with zero gas, re-
cording and validating of 10 measuring values (zero point validation), output
of the measuring values, measuring AAC measurement medium 1, and so on
until measuring AAC measurement medium 5, purging with sample gas,
output of the set values and actual values of the FTIR span values (span vali-
dation).
The AAC runs continuously with FTIR reference and O
The complete sequence takes max. 45 minutes: Purging with zero gas, FTIR
reference recording and O
values, measuring AAC measurement medium 1, and so on until measuring
AAC measurement medium 5, purging with sample gas, output of the set
values and actual values of the FTIR span values.
The cycle time specifies the time intervals in which the AAC is completed.
Recommended setting: 7 days.
The analyzer system completes the next AAC at the time specified here. From
this moment in time, the cycle period starts to run.
Recommendation for step-by-step AAC cycle: Set date and time so that no
half-hourly average values are lost.
Information display. The number of AAC steps depends on the number of
components. The cycle is: zero point – validation cell 1 – validation cell 2 – vali-
dation cell 3 – validation cell 4 – validation cell 5
Information display.
The waiting time between two AAC steps must be set.
Recommendation for step-by-step AAC cycle: Set interval so that no
half-hourly average values are lost (min. 1 hour).
The analyzer system is purged with zero air before the AAC. Two parameters
must be set: The time after connecting the zero air until the AAC begins and
the time after re-connecting the measurement gas until the gas paths are
purged at the beginning of measuring, so that no residual gas can influence
the results of the AAC or the measurement.
Recommended setting: Purging should last at least triple the T90 time of the
entire analyzer system (typically 240 seconds).
Zero air is piped through the analyzer system during the AAC. The setting
must be configured as to whether the zero air is emitted locally at the ana-
lyzer system or via sampling.
The AAC is always canceled in the event of a system bus error and when set-
ting the block input. You can configure if the AAC is to be terminated when
one of the three states occurs during the procedure: "System failure", "Ana-
lyzer failure" or "Analyzer maintenance request".
When canceling, the sequence of the AAC is reset. This means that "1 zero
point" is executed as the first step when restarting the AAC. When canceling,
no QAL3 data set is generated.
| OI/ACF5000-EN REV. A
span value are output after the
2
span adjustment, output of set values and actual
2
79
span adjustment.
2
span adjustment.
2