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TE-1000 PUF 27 Operations Manual
Determination of Flow Rate
To figure out the total volume of air that flowed through the PUF sampler during
your sampling run take a set-up magnehelic gage reading (when you set the
sampler up manually turn it on and take a magnehelic gage reading; in our
example it should be 60 inches) and a pick-up reading (after the sample has been
taken again manually turn sampler on and take a magnehelic gage reading; for
our example let's say it read 54 inches). Take 60 + 54 = 114 114/2 = 57 so the
magnehelic gage reading you would use is 57 inches. Put that into the formula (on
bottom of worksheet):
1/m([Sqrt(magn)(Pav/760)(298/Tav)]- b)
m = sampler slope
b = sampler intercept
magn = average magnehelic gage reading
Tav = daily average temperature
Pav = daily average pressure
Sqrt = square root
Example:
m3/min = 1/35.3693([Sqrt(57)(751.3/760)(298/293.2)]-(-1.6711))
m3/min = .0282731 ([Sqrt(57)(.9885526)(1.016371)] + 1.6711)
m3/min = .0282731 ([Sqrt(57.269962)] + 1.6711)
m3/min = .0282731 ([(7.5676919)] + 1.6711)
m3/min = .0282731 (7.5676919 + 1.6711)
m3/min = .0282731 (9.2387919)
m3/min = .2612092
lpm = 261.2092
Total liters of air = lpm x 60 x hours that sampler ran
Let's say our sampler ran 23.9 hours
(end ETI reading - start ETI reading)
** Make sure ETI is in hours otherwise convert to hours **
Total liters of air = 261.2092 x 60 x 23.9 = 374,573.99 liters of air.
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