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Setup Menu T400 Ozone Analyzer Operator’s Manual
100
5.4.1.6. SETUP RNGE UNIT: Setting the Reporting Range Unit Type
The T400 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:
O3 ppb x 2.14 = O3 ug/m3
O3 ppm x 2.14 = O3 mg/m3.
06870C DCN6332