Dwyer 8901 - Manual (Page 15)

We would suggest to set the free area
dimension before you start measuring
the air velocity so after you measure the
air velocity, you can jump to the air flow
mode to view the cubic feet per minute
without further changing the free area
dimension.
3 CFM (ft /min)
2 = Air Velocity (ft/min)xArea (ft )
3 CMM (m /min)
2 = Air Velocity (m/sec)xArea (m ) x 60
Cubic equations:
Units Conversion Table:
1 m/s=
1 ft/min=
1 knots=
1 km/hr=
1 mph=
m/s
1
0.00508
0.5144
0.2778
0.4464 ft/min
196.87
1
101.27
54.69
87.89 knots
1.944
0.00987
1
0.54
0.8679
1 m/s=
1 ft/min=
1 knots=
1 km/hr=
1 mph=
km/hr
3.6
0.01829
1.8519
1
1.6071 mph
2.24
0.01138
1.1523
0.6222
1
Note:
On initial start up the unit will display
pH, knots. (See Fig.15)
MIN
mil/h cfm
AVG
REC
FLOW
km/h cms
AREA
m/s
vel Hold PH Knots
ft/m 2 ft
2 m
MAX
Fig.15
14