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TE-PNY1123 25 Operations Manual
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.
Using Qstd as our x-axis, and FLOW (corrected) 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:
15.
m =
 
( x)( y)
xy - n
x ; b = y - mx
x - n
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:
16. r =
 
( x)( y)
xy - n
x-
x
n y-
y
n
22
 
2 2
where:
n = number of observations
= sum of
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