Appendix A: Temperature And Pressure Corrections - Alnor Velometer 6000 Serie Manual De Uso

Velometer correction factors
TEMPERATURES AND PRESSURE
The maximum temperature of the air or gas that can be tested by the
Velometer is 250°F (120°C). When the temperature of the gas inside a
duct is appreciably different from the density at which the Velometer was
calibrated, a correction factor may be needed to obtain the most accurate
measurement. The actual velocity is obtained by multiplying the
measured velocity by a correction factor as shown in the figure below.
520 560
100
90
80
70
60
50
20 22
O) x 7.36 (10
Note: 1 (in. H
2
APPENDIX A:
CORRECTIONS
AIR PRESSURE
(mm. Hg)
600 640 680 720
24 26 28
AIR PRESSURE
(in. Hg)
-2
) = 1 in.Hg.
760 800
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
30 32
19