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Note that the ambient temperature is needed in degrees Kelvin to satisfy the
Qa equation. Also, the barometric pressure needs to be reported in
millimeters of mercury (if sea level barometric pressure is used it must be
corrected to the site elevation). In our case the two following conversions
may be needed:
8. degrees Kelvin = [5/9 (degrees Fahrenheit - 32)] + 273
9. millimeters of mercury = 25.4(inches of H2O/13.6)
Inserting the numbers from the calibration worksheet test number one we
get:
10. Qa = 1/.92408[Sqrt((3.8)(293/749.3))- (-0.00383)]
11. Qa = 1.0821573[Sqrt((3.8)(.3910316)) + 0.00383]
12. Qa = 1.0821573[Sqrt(1.48592) + 0.00383]
13. Qa = 1.0821573[1.2189831 + 0.00383]
14. Qa = 1.0821573[1.2228131]
15. Qa = 1.323
It is possible that your answers to the above calculations may vary. This is
most likely due to different calculators carrying numbers to different decimal
points. This should not be an area of concern as generally these variations
are slight.
With Qa determined, the sampler H2O reading needs to be converted to mm
Hg using the following equation:
16. Pf = 25.4 (in. H2O/13.6)
where:
17. Pf is recorded in mm Hg
18. in. H2O = sampler side pressure reading during calibration
Inserting the numbers from the worksheet:
19. Pf = 25.4(6.4/13.6)
20. Pf = 25.4(.4705882)
21. Pf = 11.95294 mm Hg
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