228 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Cancel management
Automatic calibration is always terminated when there is a system bus fault
and when the input "block" is set (for example, when the control signal
"Block automatic calibration" is applied).
You can configure if the automatic calibration is to be terminated when one
of the three states occurs: "System failure", "Analyzer failure" or "Analyzer
maintenance request".
You can also configure if gas analyzer should repeat automatic calibration
after the cause of termination has been eliminated. Set the number of repe-
titions and the time between repetitions.
NOTE
The configured repetition is not effective when the automatic calibration
has been terminated by enabling the input "Cancel" of the Autocalibration
function block.
Pump
Setting should be made whether the pump is on or off during automatic
calibration-on or off. This setting also applies to manual calibration.
Purge time
Setting should be made for the length of the interval
• between turning on the zero gas flow and starting zero calibration;
• between turning on the test gas flow and starting span calibration
• between restarting the sample gas flow and initiating measurement
so that gas residues do not distort the calibration or the measurement re-
sult.
NOTE
The purge time should be set to at least three times the T
90
time of the en-
tire analyzer system.
Single zero-point calibration
Settings should be made whether zero calibration will always or never be
carried out alone, i.e. without subsequent span calibration.
Single span calibration
Settings should be made whether span calibration will always or never be
carried out alone, i.e. without prior zero calibration.
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