PROGRAMMING
4-34
4.7.9
Change Unit
User can change the display and datalog unit from parts per
million (ppm) to milli-gram per cubic meter (mg/m
3
).
1.
“Change 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 = ppm?” or “Display Unit = mg?”
3.
Press
[Y/+]
key to accept the currently displayed unit. Press
[N/-]
key to toggle to the other unit. Press
[MODE]
key to
exit this sub-menu.
4.
If there is any change to the existing selection, press
[Y/+]
to confirm the new selection or press
[N/-]
or
[MODE]
to
discard the changes and move to the next sub-menu.
Caution:
1.
The correction factor in the gas library is calculated
based on “ppm” unit
.
If “mg” unit is selected, the built-
in correction factor library is not valid
.
2.
No automatic conversion between “ppm” and “mg
/
m
3
”
reading is performed by the monitor.
3.
When the unit name is changed from “ppm” to “mg”,
the unit must be recalibrated with the span gas
concentration entered in mg/m
3
. The converse rule
applies when the unit is changed from “mg” to “ppm”.
Summary of Contents for MiniRAE 2000 PGM-7600
Page 93: ......
