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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(17.3/13.6)
20. Pf = 25.4(1.2720588)
21. Pf = 32.31 mm Hg
Po/Pa is calculated next. This is done using the following equation:
22. Po/Pa = 1 - Pf/Pa
23. where: Pa = ambient barometric pressure during calibration, mm Hg.
Inserting the numbers from the worksheet:
24. Po/Pa = 1 32.31/747
25. Po/Pa = 1- .0167989
26. Po/Pa = .957
Use Po/Pa and the ambient temperature during the calibration (Ta) to locate the flow for the calibration
point in the Look Up table. Record this in the column titled Look Up. Calculate the percent
difference using the following equation:
27. % Difference = (Look Up flow - Qa)/Qa * 100
Inserting the numbers from the worksheet:
28. % Difference = (1.193 - 1.164)/1.164 * 100
29. % Difference = (0.029)/1.164 * 100
30. % Difference = (0.024914) * 100
31. % Difference = 2.49
The above calculations have to be performed for all five calibration points.
Operational Flow Rate
Take a side tap reading with only a filter in place.
in. H2O = 21.75
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