Teledyne M300EM operation manual Basic Operation, reporting units, Pressure STP, sufficient

Basic Operation Teledyne API – Technical Manual - Model 300E Family CO Analyzers

6.6.4.SETUP  RNGE  UNIT: SETTING THE REPORTING RANGE UNITS OF MEASURE

The M300E/EM can display concentrations in parts per million (106 mols per mol, PPM) or milligrams per cubic meter (mg/m3, MG). Changing units affects all of the display, COMM port and iDAS values for all reporting ranges regardless of the analyzer’s range mode. To change the concentration units:

NOTE

In order to avoid a reference temperature bias, the analyzer must be recalibrated after every change in

reporting units.

NOTE

Concentrations displayed in mg/m3 and ug/m3 use 0°C @ 760 mmHg for Standard Temperature and

Pressure (STP).

Consult your local regulations for the STP used by your agency.

(Example: US EPA uses 25°C as the reference temperature).

Once the Units of Measurement have been changed from volumetric (ppb or ppm) to mass units (µg/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.

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