118 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 9 Calibration
Automatic calibration: Control
Starting automatic calibration
Cyclic timed start
Automatic calibration is normally started cyclically on a time-
controlled basis by the internal clock of the gas analyzer.
The cycle time is set in the configurator.
Externally controlled start
For external starting of the automatic calibration, a control
signal is required at the digital input DI1 ‘Start automatic
calibration’ on the digital I/O module 1 (default configuration).
Control signal requirements:
Refer to Digital I/O module on page 97.
The control signal must be present for at least 1 s.
To stop the automatic calibration externally, another digital
input must be configured.
The control signal must fulfill the same requirements as the
signal for the external start.
Automatic calibration can also be started and stopped via
Modbus.
Manual Start
The automatic calibration can be manually started on the display
and control unit.
Refer to Automatic calibration: manual start on page 123.
Blocking automatic calibration
To block automatic calibration, a control signal (high level) at the
digital input DI2 ‘Block automatic calibration’ on the Digital I/O
module 1 (default configuration) is needed.
• As long as the control signal is present (high level),
automatic calibration is blocked.
• If the control signal is activated at a point in time at
which a cyclically controlled automatic calibration would
start, this calibration will be suppressed.
– In this case, the automatic calibration is triggered
immediately after switching to the low level.
– if the automatic calibration cycle set in the
configurator is not affected by this, the interval to the
next automatic calibration will then be shorter.
• Powering up the control signal causes an ongoing
automatic calibration to be aborted.
After switching the control signal to low level, the next
automatic calibration takes place according to the cycle
time set in the configurator.
Control signal requirements:
Refer to Digital I/O module on page 97.
The control signal must be present for at least 1 s.
Automatic calibration can also be blocked via the Modbus.
Process display
The status icon appears on the LCD display during automatic
calibration
, see Status Icons on page 108.
The status message ‘Autocalibration running’ is active and the
status signal ‘Function check’ is set.
Note
• The automatic calibration must not be triggered while the
gas analyzer is being operated using the test and calibration
softwareOptima TCT Light.
• When an automatic calibration is running, it is not possible to
perform a manual calibration, measure a calibration cell,
perform a calibration reset and operate the pump.
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