PROGRAMMING
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4.7.9 Changing the Units
Table 4-7. Units Sub-Menu
Display Unit = ppb?
Display Unit = ug?
Display Unit = ppm?
Display Unit = mg?
The user can change the display and datalog units from parts
per billion (ppb), micrograms per cubic meter (ug), parts per
million (ppm), and milligrams per cubic meter (mg).
1.
“Change
Conc.
Unit?” is the ninth sub-menu item in the
Monitor Setup sub-menu.
2.
Press the [Y/+] key, the display should show the current
unit “Display Unit = xxx?”
3.
Press [Y/+] key to accept the currently displayed unit.
Press [N/-] key to toggle to the other units. Press the
[MODE] key to exit this sub-menu.
4.
If there are any changes to the existing selection, press
the [Y/+] key to save the change or press [N/-] key to
discard the change.
CAUTION:
The correction factor in the gas library is calculated based
on “ppb” and “ppm” units. If either “ug” or “mg” units are
selected, the built-in correction factor library is not valid.
The Automatic range is between “ppb” and “ppm” or
between “ug” and “mg.” There are no other automatic
conversions.When the unit name is changed from “ppb” or
“ppm” to “ug” or “mg,” calibration by using a standard
“mg” gas is required. The same rule applies when the unit
is changed back.
