Gas Units; Co Range - Thermo Scientific 48i Instruction Manual

Gas Units

CO Range

Thermo Fisher Scientific
The Gas Units screen defines how the CO concentration readings are
expressed. Gas units of parts per million (ppm) and milligrams per cubic
3
meter (mg/m ) are available. The mg/m
calculated using a standard pressure of 760 mmHg and a standard
temperature of 20 °C.
When switching from ppm to mg/m
highest range in that mode. For example, when switching from mg/m
ppm, all the ranges default to 1000 ppm. Therefore, whenever you change
units, you should also check the range settings.
In the Main Menu, choose Range > Gas Units.
●
Note If the units change from ppm to mg/m
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:
SET TO:
AND SET RANGES AND CAL
DEFAULT SETTINGSXXXXXXXXXX
 CHANGE VALUE
RANGE AVG
The CO Range screen defines the concentration range of the analog
outputs. For example, a CO range of 0–50 ppm restricts the analog output
to concentrations between 0 and 50 ppm.
The display shows the current CO range. The next line of the display is
used 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. The
example below shows the CO range screen in single mode. For more
information about the dual and auto range modes, see
Mode", "Dual Range Mode", and
chapter.
3
gas concentration mode is
3 , the analog ranges all default to the
3 or vice versa, the instrument
▲
PPM
MG/M3 ?
TOX
 SAVE
DIAGS ALARM
"Auto Range Mode" earlier in this
Model 48i Trace Level-Enhanced Instruction Manual
Operation
Range Menu
3
to
"Single Range
3-13