407114 Datasheet, PDF(8/8 Page) Extech Instruments Corporation. – CFM Thermo Anemometer Air Velocity, Air Flow, and Temperature

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407114 Datasheet, PDF (8/8 Pages) Extech Instruments Corporation. – CFM Thermo Anemometer Air Velocity, Air Flow, and Temperature

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Useful Equations and Conversions

Area equation for rectangular or square ducts

Height (H)

Width (W)

Area (A) = Width (W) x Height (H)

Area equation for circular ducts

Radius

Area (A) = x r2

Where = 3.14 and r2 = radius x radius

Cubic equations

CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)

CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60

NOTE: Measurements made in inches

must be converted to feet or meters before using the above formulae.

Unit of Measure Conversion Table

1 m/s

1 ft/min

1 knot

1 km/h

1 MPH

m/s

0.00508

0.5144

0.2778

0.4464

ft/min

196.87

101.27

54.69

87.89

knots

1.944

0.00987

0.54

0.8679

km/h

3.6

0.01829

1.8519

1.6071

MPH

2.24

0.01138

1.1523

0.6222

Model 407114 Version 2.0 November 2005