Operation
Range Menu
3-14 Model 48i Instruction Manual Thermo Electron Corporation
Gas Units The Gas Units screen defines how the CO concentration readings 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 standard pressure of 760 mmHg and a standard
temperature of 20 °C.
When switching from ppm to mg/m
3
, the analog ranges all 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. Therefore, whenever you change
units, you should also check the range settings.
• In the Main Menu, choose Range > Gas Units.
•Use and for a list of choices.
• Press to save the new units.
• Press to return to the Range menu or to return to the
Run screen.
Note If the units change from ppm to mg/m
3
or vice versa, a display
warning will appear that ranges will be defaulted and calibration parameters
reset.
XXLO WCONCENTRATIONXXLO W
CO 15.80 PPM
SAMPLE 12:34 ALARMx
GAS UNITS:
CURRENTLY: PPM
SET TO: MG/M3 ?
AND SET RANGES AND CAL TOX
DEFAULT SETTINGXXXXXXXXXXX
©ª
CHANGE VALUE
SAVE
RANGE AVG DIAGS ALARM
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