84 ACF5000 FTIR ANALYZER SYSTEM | OI/ACF5000-EN REV. A
Parameter Explanation
Enable
The cyclical automatic drift check (ADC) is only completed when it is activat-
ed.
Cycle time
The cycle time specifies the time intervals in which the ADC is completed.
Recommended setting: 7 days.
Next ADC date/time
The analyzer system completes the next ADC at the time specified here. From
this moment in time, the cycle period starts to run.
Measurement duration
Set up time during which the test gas is conducted through the analyzer
system – after purge time measuring gas → Test gas.
Purge time
meas. gas->test gas,
test gas->meas. gas
Two parameters must be set: The time after connecting the test gas until the
ADC 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 ADC or measurement.
Recommended setting: Purging should last at least triple the T90 time of the
entire analyzer system.
Gas path
The setting must be configured as to whether the test gas is emitted locally
at the analyzer system or via sampling.
Configuring the ADC operating mode
Call up operating mode configuration in the ADC menu with ADC MODE.
Operating mode Explanation
ACF5000 runs the ADC
The ports are controlled as configured. The analyzer system informs the
evaluation computer via digital outputs that the port is ready for evaluation.
The duration (purging times and measurement time) is controlled by the
analyzer system.
ACF5000 switches gas
paths only
The analyzer system is informed of which gas path needs to be connected by
the "FTIR automatic adjustment" function block via the input wiring. The
analyzer system informs the evaluation computer via digital outputs that the
gas path has been activated. All times are checked by the evaluation com-
puter. After disconnecting the gas path, the analyzer system remains in
"Maintenance mode" status for the set test gas → measurement gas purge
time plus 4 x T90 time.
Starting the gas port immediately
Start the required gas port immediately in the ADC menu with the START
PORT key.
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