60 AO2000-LS25 LASER ANALYZERS | OI/AO2000-LS25-EN REV. D
… 10 Configuration, parameterization
… Description of menus and parameters
Line width averaging:
Specifies the number of line width averaging.
Line width adaptive averaging:
Switched OFF = the rolling average (as for concentration)
applies.
Switched ON = the number of averaging depends on the signal
strength i.e. weak signals are averaged longer. NB: This will only
be effective if line width averaging is specified > 10.
Spectral temperature averaging:
Specifies the number of spectral temperature averaging.
Instrument time
The device has a built-in clock, which also runs when power is
off.
Using this menu the instrument time should be set equal to the
local time. The current device time is only downloaded from the
device after an update of parameters or explicitly after pressing
<Reload readings (P, T, date)>.
Figure 42: Menu “Config”, page 3
Selecting extra (flow) current input
Configures the extra (denoted as “Flow”) current input to the
instrument. This can be set to “None”, “Gas -%vol”, “Gas -
g/Nm
3
”, “Gas – g/m
3
”, and “Flow”.
Input “None” simply deactivates the extra current input. For all
other inputs the 4 mA and 20 mA values must be specified. The
current input can be used to connect an external gas sensor
(typically an H
2
O sensor for dry basis conversion) to the device.
In this case “Gas” input with the corresponding concentration
unit should be selected. The measured input current can be
monitored in the “Measurements” menu.
Input “Flow” is currently not implemented.
Dry basis conversion
The primary measurements of the gas concentration are always
on wet basis. The device can also present the results on dry basis
if the H
2
O concentration is known.
If <Dry basis conversion> is selected the device converts the
measured concentrations according to the following simple
equation:
N(dry) = N*100 / (100- H
2
O(%))
where N represents the original sample gas concentration of the
damp reference condition and H
2
O (%) represents the H
2
O
concentration in vol.%.
The parameter “Dry conversion factor” multiplies N and can be
monitored in the “Measurements” menu.
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