Extech Instruments HD300 Guia do Utilizador descarregar pdf (Página 10)

HD300-EN-V2.2 07/13

Useful Equations and Conversions

AREA equation for rectangular or square ducts

Area equation for circular ducts

Cubic equations

NOTE: Measurements made in inches

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

Unit of Measure Conversion Table

m/s

ft/min

knots

km/h

MPH

1 m/s

196.87

1.944

3.6

2.24

1 ft/min

0.00508

0.00987

0.01829

0.01138

1 knot

0.5144

101.27

1.8519

1.1523

1 km/h

0.2778

54.69

0.54

0.6222

1 MPH

0.4464

87.89

0.8679

1.6071

Width (W)

Height (H)

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

CFM (ft

/min) = Air Velocity (ft/min) x Area (ft

)

CMM (m

/min) = Air Velocity (m/sec) x Area (m

) x 60

Radius

Area (A) =  x r

Where = 3.14 and r

= radius x radius

1 2 ... 5 6 7 8 9 10 11 12 13 14 15

Introduction 2
Features 2
Meter Description 3
Operation 4
IR Theory 8
= 3.14 and r 10
Specifications 11
HD300-EN-V2.2 07/13 12
Warranty 13
Garantie 14
Garantía 15

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