TE-PNY1123 21 Operations Manual
The five manometer reading from bottom of blower motor need to be
converted to the current meteorological conditions using the following
FLOW (corrected) = [Sqrt("H2O)(Pa/760)(298/Ta)]
Flow (corrected) = sampler manometer readings corrected to current Pa
"H2O = sampler manometer reading 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 + celcious)
298 = standard temperature, a constant that never changes, K
After each of the manometer readings have been corrected, they are
recorded under 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
( x)( y)
xy - n
x ; b = y - mx
x - n
n = number of observations
y = ∑y/n; x = ∑x/n
∑ = sum of