TE-5170D-BL TSP MFC 19 Operations Manual
The continuous flow recorder readings taken during the calibration need to be corrected to the
current meteorological conditions using the following equation:
IC = I[Sqrt((Pa/760)(298/Ta))]
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 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:
 
( x)( y)
xy - n
x ; b = y - mx
x - n
 
The equation for the coefficient of correlation (r) is as follows:
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