ABB EasyLine EL3000 - Page 120

120 EL3000 CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
… 9 Calibration
… Automatic calibration: settings
Output current response
In the configurator, you need to set whether during the
calibration process, the signals at the current outputs (analog
outputs) are held at the last measured value before the
calibration was started or if they follow the measured value
changes during calibration.
If the current signals are configured to ‘Hold’, the limit value
monitor is not active during the calibration.
Setting the output current response is effective for both
automatic and manual calibration.
Uras26 and Limas23: Automatic calibration with or without
calibration cells
If the Uras26 or Limas23 analyzer is equipped with calibration
cells, automatic calibration using calibration cells is enabled by
default.
If automatic calibration with calibration cells is deactivated in
the configurator for individual sample components and if
calibration should be performed with test gases instead, the
following must be observed:
• The test gases for zero point and end-point calibration
must be connected via solenoid valves; control of the
solenoid valves via digital outputs must be configured
(see Configuring signal inputs and outputs on page 152).
• Automatic calibration is performed in the following steps:
1. The zero point gas is connected in and all sample
components are calibrated at the zero point.
2. The zero point gas remains connected and the sample
components with the activated calibration cell are
calibrated at the end-point.
3. The span gases are connected and the sample
components with the deactivated calibration cells are
calibrated at the end-point.
In the process, the span gas valves are switched in the
sequence specified in the configurator in dialog
‘Automatic Calibration’ column ‘Span Gas Valve’
(1 to 5).
Oxygen sensor
If an electrochemical oxygen sensor is installed in the gas
analyzer together with the Uras26 or Limas23 analyzer, iyou need
to configure how the end-point calibration of the oxygen sensor
is carried out:
End-point calibration
Entry in ‘Span gas valve’ column
With zero point gas during zero
point calibration
0
With test gas during end
-point
calibration
1
to
5, depending on which span gas valve
is used to connect the test gas (oxygen)