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Using Po/Pa and the ambient temperature during the calibration, consult the
Look Up Table to find the actual flow rate. Record these flows in the column
titled Look Up.
Calculate the percent difference between the calibrator flow rates and the
sampler flow rates using the following equation:
% Diff. = (Look Up Flow - Qa)/Qa * 100
where: Look Up Flow = Flow found in Look Up Table, m3/min
Qa = orifice flow during calibration, m3/min.
The EPA guidelines state that the percent difference should be within + or - 3
or 4%. If they are greater than this a leak may have been present during
calibration and the sampler should be recalibrated.
Example Calculations
The following example problems use data from the attached VFC sampler
calibration worksheet.
After all the sampling site information, calibrator information, and
meteorological information have been recorded on the worksheet, actual air
flows need to be determined from the orifice manometer readings taken
during the calibration using the following equation:
1. Qa = 1/m[Sqrt((H2O)(Ta/Pa))-b]
where:
2. Qa = actual flow rate as indicated by the calibrator orifice, m3/min
3. H2O = orifice manometer reading during calibration, in. H2O
4. Ta = ambient temperature during calibration, K ( K = 273 + oC)
5. Pa = ambient barometric pressure during calibration, mm Hg
6. m = slope of Q actual orifice calibration relationship
7. b = intercept of Q actual orifice calibration relationship.
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