Anemostat RF11 - Manual (Page 10)

10
1220 Watson Center Road • Carson, CA 90745
Tel: (310) 835-7500 • Fax: (310) 835-0448
www.anemostat.com • [email protected]
Altitude Correction Factors
Barometric
Pressure
Altitude Density Correction
(in h.g.) (feet) lb/ft3 Factor
29.92 0 .075 1.03
20.28 500 .074 1.01
28.85 1000 .072 0.99
28.33 1500 .071 0.98
27.82 2000 .070 0.96
27.32 2500 .068 0.95
26.81 3000 .067 0.93
26.33 3500 .066 0.91
25.84 4000 .065 0.89
25.37 4500 .064 0.88
24.89 5000 .062 0.86
24.44 5500 .061 0.85
23.98 6000 .060 0.83
23.54 6500 .059 0.82
23.09 7000 .058 0.80
Example: Determine the airflow sensor signal of aN 8H unit at 2170 CFM
located at an elevation of 5000 ft., for a 3000 series pneumatic controller.
To use the correction factor:
Correction factor X CFM at unit location = .86 x 2170 = 1870 CFM
Referencing the 8H flow curve, shown on page 9, find 1870 CFM @ .64” w.c.
sensor signal pressure. The velocity controller set at .64” signal pressure will
result in 1870 CFM at 5000 ft. elevation.