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TE-5200 15 Operations Manual
760 = standard barometric pressure, a constant that never changes, mm Hg
Ta = ambient temperature during calibration, K ( K = 273 + oC)
298 = standard temperature, a constant that never changes, K
After each of the sampler manometer readings have been corrected, they are
recorded in the column titled FLOW (corrected).
Using Qstd and 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.
The equations for determining the slope (m) and intercept (b) are as follows:
m =
 
 
xy x y
n
xx
n
; b = y - mx
 
2
2
where:
n = number of observations
y = y/n
x = x/n
= sum of.
The equation for the coefficient of correlation (r) is as follows:
 
 
r =
xy x y
n
xx
nyy
n
 
2
2
2
2
where:
n = number of observations
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