Calibration of Analog Output Signal
Calibration of the analog output signal is usually only relevant after reloading new facto-
ry/default settings. The calibration of the analog signal is carried out in one of the follow-
ing ways:
Option 1: Input of tested values
• Select ZeroCalCnt and key in the value according to the ZeroCalCnt value in the
Testing & Configuration Sheet attached to each specific analyzer. Press to save.
The screen will automatically return to the Analog setup Ao00 screen.
• Select SpanCalCnt and key in the value according to the value in the SpanCalCnt
value in the Testing & Configuration Sheet attached to each specific analyzer. Press
to save.
Option 2: Manual calibration
Only if the analog signal does not function properly with the input of the tested values –
Calibration Option 1, the analog signal shall be calibrated manually. For manual calibra-
tion of analog signal 1 (Ao00), zero test gas and instrument air shall be used.
Connect a current meter with a range 4-20 mA between terminal A-OUT connection 1 &
2.
For zero calibration:
• Select DispMin. Enter the oxygen value of the zero test gas and save.
• Introduce zero test gas to the sensor.
• Select ZeroCalCnt. Then adjust and save the value to correspond with 4 mA output.
• Select DispMin. Change the value back to the minimum value of the scale required by
the external instrumentation (usually 0% O2 – in rare cases other values).
For span calibration:
• Select DispMax. Enter 20.9 (oxygen % in the instrument air) and save.
• Introduce the instrument air to the sensor.
• Select SpanCalCnt. Then adjust and save the value to correspondent with 20 mA out-
put.
• Select DispMax. Change the value back to the maximum value of the scale required
by the external instrumentation (usually 25% O2 – in some cases 10% O2 - in rare
cases other values).
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