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TE-1000 PUF 20 Operations Manual
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. In our case the two following conversions may be needed:
2. degrees Kelvin = [5/9 (degrees Fahrenheit - 32)] + 273
3. millimeters of mercury = 25.4(inches of H2O/13.6)
Inserting the numbers from the calibration worksheet run point number one we
get:
4. Qstd = 1/9.82823[Sqrt((7.5)(756.9/760)(298/294.8)) - (-.03871)]
5. Qstd = .1017477[Sqrt((7.5)(.996)(1.011)) + .03871]
6. Qstd = .1017477[Sqrt(7.55217) + .03871]
7. Qstd = .1017477[2.7481211 + .03871
8. Qstd = .1017477[2.7868311]
9. Qstd = .284
Throughout these example problems you may find that your answers vary some
from those arrived at here. This is probably due to different calculators carrying
numbers to different decimal points. The variations are usually slight and should
not be a point of concern.
With the Qstd determined, the corrected Magnehelic Gage reading FLOW
(corrected) for this run point needs to be calculated using the following equation:
10. FLOW (corrected) = Sqrt((magn)(Pa/760)(298/Ta))
where:
FLOW (corrected) = Magnehelic Gage readings corrected to standard
magn = Magnehelic Gage readings during calibration
Pa = ambient barometric pressure during calibration, mm Hg.
760 = standard barometric pressure, mm Hg
Ta = ambient temperature during calibration, K ( K = 273 + Co)
298 = standard temperature, K.
Inserting the data from run point one on the calibration worksheet we get:
11. FLOW (corrected) = Sqrt((70)(756.9/760)(298/294.8))
12. FLOW (corrected) = Sqrt((70)(.996)(1.011))
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