62 EL3060 CONTINUOUS GAS ANALYZERS | OI/EL3060-EN REV. A
Automatic calibration: Control
Starting the automatic calibration
Start on a cyclically time-controlled basis
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 configu-
rator (see page 53).
Externally controlled start
A control signal at digital input DI1 "Start automatic calibration" on digital
I/O module 1 (see page 39) (standard configuration) is required for the ex-
ternal start of the automatic calibration.
Requirements for the control signal: Edge Low 0 to 3 V → High 12 to 24 V.
After the transition Low → High, the high level must be present for at least
1 s.
A further digital input must be configured for the external stop of the auto-
matic calibration. The control signal must fulfill the same requirements as
for the signal for the external start.
The automatic calibration can also be started and stopped via the Modbus.
Manual start
The automatic calibration can be manually started (see page 66) on the dis-
play and operator control unit. Menu path:
Operation Calibration Automatic Calibration
Disabling the automatic calibration
A control signal at digital input DI2 "Disable automatic calibration" on digital
I/O module 1 (see page 39) (standard configuration) is required to disable
the automatic calibration.
Requirements for the control signal: High level 12 to 24 V. Automatic calibra-
tion is disabled as long as the high level is active. Automatic calibration in
progress is aborted by switching on the control signal.
The next automatic calibration after switch-over to low level is started in
accordance with the cycle time set in the configurator.
The automatic calibration can also be disabled via the Modbus.
Process display
The status icon appears in the display during automatic calibration. The
status message "Autocalibration running" is active, and the status signal
"Maintenance mode" is output.
NOTE
Automatic calibration may not be initiated when the gas analyzer is being
operated with the test and calibration software TCT.
When automatic calibration is running, it is not possible to carry out manual
calibration, measure a calibration cell, carry out a calibration reset or oper-
ate the pump.
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