AO2000-LS25 LASER ANALYZERS | OI/AO2000-LS25-EN REV. D 61
Input methods for H
2
O
The following input methods for the H
2
O concentration are
available:
• Method “Fixed” sets the H
2
O concentration equal to the
manually specified value.
• With method “Current loop” the H2O concentration is
input from an external H
2
O sensor via the Extra (Flow)
current input. In this case, the parameter “Extra (flow)
current input select” should be set to “Gas-unit”, where
“unit” equals the unit of the external H
2
O sensor output
concentration. The 4 mA and 20 mA values must be
specified.
• Method “Measured” can be used when the analyzer is
configured to measure several gases and one of them is
H
2
O. Even if the measured concentration exceeds this
value that is used to convert it to a dry reference state,
50 vol.% is still valid.
• If the method “Calculated” is enabled, the device
calculates the saturated water vapor concentration,
which is based on the input values of the gas temperature
and the gas pressure.
The calculated H
2
O concentration is then used for dry
basis conversion.
The maximum gas temperature for this method is
approximately 90 °C, the calculated max. H
2
O
concentration being limited to 70 vol.%. The same H
2
O
restriction is used for the methods “Fixed” and “Current
loop”.
Gas specific parameters <Gas specific parameters>
If the instrument monitors more than one absorption line a
selection menu with the relevant gases appears first.
Upon selection of the gas the following menu is displayed:
Figure 43: Menu ‘Gas specific parameters’
Sample gas (Measured gas)
Displays the gas type. Cannot be modified if the program runs in
User mode.
Unit (Unit)
Select the appropriate unit for output of the gas concentration
from the dropdown list.
The units can be grouped into two different categories.
Absolute units: g/m
3
, mg/m
3
and µg/m
3
and relative units: %,
ppm, ppb, g/Nm
3
, mg/Nm
3
and µg/Nm
3
.
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