4.9.5 Checking the alternate gas composition
The
Aurora H2O
TDLAS is normally calibrated to a standard
gas mixture that is representative of “typical” natural gas.
The primary components and concentrations of this gas
mixture are as follows:
Component
Concentration
Methane (CH4)
90.0%
Nitrogen (N
2
)
6.0%
Carbon dioxide (CO
2
)
4.0%
For special applications, where the composition of the gas
to be measured differs significantly from the standard,
Panametrics can provide an alternate calibration. If this
service has been ordered, the
Aurora H2O
will be shipped
from the factory with both the standard and a custom
calibration installed.
The calibration in use
can be verified at any
time using the
Aurora
H2O
about… menu. From
the main menu, select
about and press enter. The
following screen appears.
From the about Aurora
menu, select gas
composition and press
enter. The following screen
appears. An identifier label
for the gas composition
will be displayed above
the components:
Gas composition identifier
4.10 Locking/unlocking the display
To lock the
Aurora H2O
against any future
changes, from the main
menu select lock and
press enter. The screen
returns to the standard
display.
NOTE:
This menu option
is the same as exiting the
programming menu and
waiting for a keypad time-
out to lock the keypad.
To unlock the
Aurora H2O
for changes, press cancel,
enter, cancel as instructed
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