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TE-5170 TSP MFC 20 Operations Manual
IC = I[Sqrt((Pa/760)(298/Ta))]
where:
IC = continuous flow recorder readings corrected to current Ta and Pa
I = continuous flow recorder readings during calibration
Pa = ambient barometric pressure during calibration, mm Hg.
760 = standard barometric pressure, a constant that never changes, mm Hg
Ta = ambient temperature during calibration, K ( K = 273 + °C)
298 = standard temperature, a constant that never changes, K
After each of the continuous flow recorder readings have been corrected, they are
recorded in the column titled IC (corrected).
Using Qstd and IC (or FLOW (corrected)) as the x and y axis respectively, a slope,
intercept, and correlation coefficient can be calculated using the least squares
regression method. The correlation coefficient should never be less than 0.990 after a
five point calibration. A coefficient below .990 indicates a calibration that is not linear
and the calibration should be performed again. If this occurs, it is most likely the result
of an air leak during the calibration or high wind speed during the calibration
procedure.
The equations for determining the slope (m) and intercept (b) are as follows:
m=
 
n -
x
xm - y = b ;
x
n -xy
y)x)((
2
2

The equation for the coefficient of correlation (r) is as follows:
r =
 
( x)( y)
xy - n
x-
x
n y-
y
n
22
 
2 2
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