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TE-5000-BL TSP 18 Operations Manual
where:
Qstd = actual flow rate as indicated by the calibration orifice, m3/min
H2O = orifice manometer reading during calibration, in. H2O
Ta = ambient temperature during calibration, K ( K = 273 + C)
298 = standard temperature, a constant that never changes, K
Pa = ambient barometric pressure during calibration, mm Hg
760 = standard barometric pressure, a constant that never changes, mm Hg
m = Qstandard slope of orifice calibration relationship
b = Qstandard intercept of orifice calibration relationship
Once these standard flow rates have been determined for each of the five run points,
they are recorded in the column titled Qstd, and are represented in cubic meters per
minute.
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))]
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 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.
The equations for determining the slope (m) and intercept (b) are as follows:
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