TE-1000 PUF 19 Operations Manual
r =
 
 
( x)( y)
xy - n
n y-y
 
where: n = number of observations
= sum of
If you wanted to set this sampler at .242 m3/min (8.5 CFM or 242 LPM) (Make sure
the ball valve is open fully, a 4" filter is in place, and the module is loaded) you
would turn the voltage control screw or variac until the Magnehelic Gage read 60
inches. By making sure that the sampler is operating at a Magnehelic Gage reading
that is within the acceptable range, it can be assumed that valid PUF data is being
Example Problems
The following example problems use data from the attached calibration worksheet.
After all the sampling site information, calibrator information, and meteorological
information have been recorded on the worksheet, standard air flows need to be
determined from the orifice manometer readings taken during the calibration using
the following equation:
1. Qstd = 1/m[Sqrt((H20)(Pa/760)(298/Ta))-b]
Qstd = actual flow rate as indicated by the calibrator orifice, m3/min
H20 = orifice manometer reading during calibration, in. H20
Ta = ambient temperature during calibration, K ( K = 273 + Co)
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.
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