TE-5000-BL TSP 20 Operations Manual
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((H2O)(Pa/760)(298/Ta)))-b]
where:
Qstd = actual flow rate as indicated by the calibration orifice, m3/min
H2O = orifice manometer reading during calibration, in. H2O
Ta = ambient temperature during calibration, K ( K = 273 + C)
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.
Note that the ambient temperature is needed in degrees Kelvin to satisfy the Qstd
equation. Also, the barometric pressure needs to be reported in millimeters of
mercury and it has to be at the site pressure.
The following conversions may be needed:
2. degrees Kelvin = [5/9 (degrees Fahrenheit - 32)] + 273 or
degrees Kelvin = degrees Celcius + 273
3. millimeters of mercury = inches of Hg * 25.4
Inserting the numbers from the calibration worksheet run point number one we get:
4. Qstd = 1/1.47574[(Sqrt((7.25)(749.3/760)(298/293.2))) - (-.00613)]
5. Qstd = .6776261[(Sqrt((7.25)(.985921)(1.016371))) + .00613]
6. Qstd = .6776261[(Sqrt(7.2649459)) + .00613]
7. Qstd = .6776261[2.6953563 + .00613]