TE-5170D-BL TSP MFC 22 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: