Gas Units - Thermo Scientific 49i Instruction Manual

Operation
Range Menu

Gas Units

3-14 Model 49i Instruction Manual
The Gas Units screen defines how the O
expressed. Gas units of parts per billion (ppb), parts per million (ppm),
micrograms per cubic meter (μg/m
(mg/m
calculated using a standard pressure of 760 mmHg and a standard
temperature of 20 °C.
When switching the selected units from ppb or ppm to μg/m
the analog ranges all default to the highest range in that mode. For example,
when switching from mg/m
Therefore, whenever you change units, you should also check the range
settings.
• In the Main Menu, choose Range > Gas Units.
• Use
• Press
Note If the units change from ppb/ppm to μg/m
instrument should be re-calibrated, particularly if the user's standard
temperature is different from 20 °C. A display warning will appear that
ranges will be defaulted and calibration parameters reset.
GAS UNITS:
CURRENTLY:
AND SET RANGES AND CAL
DEFAULT
RANGE
O Range
The O
3
For example, an O
concentrations between 0 and 500 ppb.
The display shows the current O
to change the range. The range screen is similar for the single, dual, and auto
range modes. The only difference between the screens are the words "High"
or "Low" displayed to indicate which range is displayed. For more
3 ) are available. The μg/m
3
and to scroll through a list of choices.
to save the new units.
SET TO:
SETTINGSXXXXXXXXXX
CHANGE VALUE
AVG DIAGS ALARM
Range screen defines the concentration range of the analog outputs.
3
range of 0–500 ppb restricts the analog output to
3
concentration reading is
3
3
), or milligrams per cubic meter
3
3
and mg/m gas concentration modes are
to ppm, all the ranges default to 200 ppm.
3
/mg/m
PPB
UG/M3 ?
TOX
SAVE
range. The next line of the display is used
3
3
3
or mg/m ,
3
or vice-versa, the
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