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M400E Ozone Analyzer Operator’s Manual Basic Operation of the M400E Analyzer
6.4.4.6. SETUP RNGE UNIT: Setting the Reporting range Unit Type
The M400E can display concentrations in ppb, ppm, ug/m
3
, mg/m
3
units. Changing units affects all of the COM
port values, and all of the display values for all reporting ranges.
To change the units of measure press:
NOTE
Concentrations displayed in mg/m
3
and ug/m
3
use 0C, 760 mmHg for Standard Temperature and
Pressure (STP).
Consult your local regulations for the STP used by your agency.
NOTE
Once the Units of Measurement have been changed, the unit MUST be recalibrated, as the “expected
span values” previously in effect will no longer be valid.
Simply entering new expected span values without running the entire calibration routine is not
sufficient.
The following equations give approximate conversions between volume/volume units and
weight/volume units:
O
3
ppb x 2.14 = O
3
ug/m
3
O
3
ppm x 2.14 = O
3
mg/m
3
04315 Rev. C1 75