240 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Test gas flow monitoring (pressure switch)
Test gas pressure and test gas flow
If the test gas pressure is set in such a way that the test gas flow at the
sample gas inlet complies with the gas inlet conditions (130 to 250 l/h.),
then the test gas surplus flows in the direction of the gas sampling point
and thus prevents sample gas fractions from falsifying the calibration result.
If the test gas is connected directly at the sample gas inlet (see also "Fidas24:
Gas line connection" (see page 97) section), here too an unpressurized sur-
plus (130 to 250 l/h) must be provided.
Test gas flow monitoring during automatic calibration (pressure
switch)
If the test gases are connected at the separate test gas inlets, the built-in
pressure switch can be activated during automatic calibration to monitor
the flow of the test gases. If the flow is insufficient, calibration is stopped.
The pressure switch can be activated for
• zero gas,
• span gas and
• zero and span gas.
Menu path
MENU → Configure → Calibration Parameters → Automatic
Calibration → Advanced settings → Pressure switch activated for
Test gas connection at the sample gas inlet during manual calibra-
tion
If the test gas is connected directly at the sample gas inlet during manual
calibration, when the pressure switch is activated the following message
appears in the display:
No calibration gas, pressure switch has not detected any
calibration gas.
This message can be bypassed by pressing the Back key.
Wait until the warm-up phase has ended
The analyzer module should only be calibrated after the warm-up phase (see
page 135).
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