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Model 9110T NOx Analyzer Setup Menu
Teledyne Analytical Instruments 104
5.4.3.4. SETUP RNGE UNIT: Setting the Reporting Range Units of Measure
The 9110T can display and report concentrations in ppb, ppm, ug/m
3
, mg/m
3
units. Changing units
affects all of the COMM port values, and all of the display values for all reporting ranges. To change the
units of measure press:
IMPORTANT
IMPACT ON READINGS OR DATA
Concentrations displayed in mg/m3 and ug/m3 use 0C@ 760 mmHg for
Standard Temperature and Pressure (STP).
Consult your local regulations for the STP used by your agency.
(Example: US EPA uses 25C as the reference temperature).
Once the Units of Measurement have been changed from volumetric (ppb
or ppm) to mass units (ug/m3 or mg/m3) the analyzer 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. This will also counteract any
discrepancies between STP definitions.
5.4.3.5. SETUP RNGE DIL: Using the Optional Dilution Ratio Feature
The dilution ratio feature is a software utility option designed for applications where the sample gas is
diluted before being analyzed by the 9110T. Typically this occurs in continuous emission monitoring
(CEM) applications where the quality of gas in a smoke stack is being tested and the sampling method