Chapter 3 Operation
3-10
Gas Units
The Gas Units screen, shown below, defines how the CO concentration reading is
expressed. Gas Units of parts per million (ppm) and milligrams per cubic meter (mg/m
3
)
are available. The mg/m
3
gas concentration mode is calculated using a factory standard
pressure of 760 mm Hg and a factory standard temperature of 20
°
C.
When switching from ppm to mg/m
3
, the CO and custom ranges default to the highest
range in that mode. For example, when switching from mg/m
3
to ppm, all the ranges
default to 10,000 ppm.
The first line of the display shows the current gas units. The second line of the display is
where the gas units are selected.
To display the Gas Units screen:
From the Main Menu choose Range
From the Range Menu choose Gas Units
To use the Gas Units screen:
Use the
↑
and
↓
pushbuttons to select the gas units
Press
ENTER
to accept the choice
Press
MENU
to return to the Range menu
Press
RUN
to return to the Run screen.
Gas Units Screen
Gas Units Screen
GAS UNITS PPM
SET TO MG/M3
& RANGES TO DEFAULTS?
78 SELECT
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