TE-5170 TSP MFC 23 Operations Manual
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(749/760)(298/293)]
12. IC = 52[Sqrt(1.0023441)]
13. IC = 52[1.0011713]
14. IC = 52.06
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. (1998 Code of Federal Regulations
Parts 50 to 51 Appendix B to Part 50, Reference Method for the Determination of
Suspended Particulate Matter in the Atmosphere, 9.2.17 page 30.)
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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