Table of Contents
Advertisement
2
Operation
Example 1:
An FMA-904 Hot wire anemometer is being checked in the Wind Tunnel
at 2.5 m/s (492 FPM) air speed. The Environmental conditions are:
Barometric Pressure = 27.88 inches of Hg
Ambient Temperature = 80 ºF
The FMA-904 measures 442 FPM. Calculate the actual air speed:
Actual Air speed = Measured Value (Average value over one minute time) x
K1 x K2
K1 = (29.92/P) x (460 + T)/530
K1 = (29.92/27.88) x (460 + 80)/530
K1 = 1.093
From Table 1, K2 for FMA-904 @ 2.5 m/s is 1.04
Actual Air speed = 442 x 1.093 x 1.04
Actual Air speed = 502 FPM
Example 2:
An HHF92A Vane type anemometer is being checked in the Wind Tunnel at
15 m/s (2953 FPM). The HHF92A measures 2848 FPM. Calculate the actual air
speed:
Actual Air speed = Measured Value (Average value over one minute time) x K2
From Table 1, K2 for HHF92A @ 15 m/s is 1.04
Actual Air speed = 2848 x 1.04
Actual Air speed = 2962 FPM
7
Advertisement
Table of Contents
