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9. Qstd = 1.831
Throughout these example problems you may find that your answers vary some
from those arrived at here. This is probably due to different calculators carrying
numbers to different decimal points. The variations are usually slight and should not
be a point of concern.
With the Qstd determined, the corrected chart reading (IC) for this run point needs
to be calculated using the following equation:
10. IC = I[Sqrt((Pa/760)(298/Ta))]
where:
IC = continuous flow recorder readings corrected to standard
I = continuous flow recorder readings during calibration
Pa = ambient barometric pressure during calibration, mm Hg.
760 = standard barometric pressure, mm Hg
Ta = ambient temperature during calibration, K ( K = 273 + C)
298 = standard temperature, K.
Inserting the data from run point one on the calibration worksheet we get:
11. IC = 52[Sqrt(749.3/760)(298/293.2)]
12. IC = 52[Sqrt(1.0020615)]
13. IC = 52[1.0010302]
14. IC = 52.05357
This procedure should be completed for all five run points. EPA guidelines state that
at least three of the five Qstd flow rates during the calibration be within or nearly
within the acceptable operating limits of 1.10 to 1.70 m3/min (39 to 60 CFM). If this
condition is not met, the instrument should be recalibrated.
Using Qstd as our x-axis, and IC as our y-axis, a slope, intercept, and correlation
coefficient can be determined using the least squares regression method.
The equations for determining the slope (m) and intercept (b) are as follows:
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