4.6.4 Setting the unit system
IMPORTANT
If the country code (see Setting the country code on page
45) has been set to 81 (Japan) the unit system menu is
not available.
To select the unit
system to be used for
measurements, select
unit system and press
enter. The following screen
appears.
Use the left and right
arrow keys to select the
unit system desired [SI
= only metric units are
available in the selection
menus; SI + US = both
metric and English units
are available in the
selection menus] and
press enter. The screen
returns to the regional
settings menu.
NOTE:
Changing the unit system setting from SI+US to SI in
the above menu will
not
immediately change the current
display or outputs units. This is because it is not possible for
the
Aurora H2O
to know the SI measurement units desired
by the operator to replace any currently displayed or output
English units. However, the next time the operator selects
different display (see Selecting primary units on page 27)
or outputs (see Selecting output units on page 29) units,
only SI units will be available in the menu.
4.7 User calibration
Beginning with software revision H2O.001.F, the
Aurora H2O
supports a two-point user calibration for use in methane/
natural gas. This is provided so that a field calibration can
be easily performed to cause the
Aurora H2O
measurement
to correspond to a calibration gas or other moisture device.
The user calibration is independent from, and does not
affect, the factory calibration. The
Aurora H2O
can be
quickly switched between user and factory calibration at
any time.
When a user calibration
is active, an asterisk (*)
will appear in the upper
left corner of the primary
display.
Before the calibration can be performed, the
Aurora H2O
must be operating correctly in methane or natural gas, with
methane selected as the background gas.
Choose settings... from the
main menu. A user cal...
selection is now provided.
NOTE:
If the
Aurora H2O
is set for Nitrogen as the background
gas, the user cal selection will be disabled/grayed out.
The
Aurora H2O
will
prompt for the user
passcode [2719]
By default, the
Aurora
H2O
is operating with
the factory calibration,
so the user calibration
menu is disabled with the
exception of the status
selection.
Select status, and
choose user as the active
calibration.
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