Useful Equations And Conversions - Extech Instruments 407113 User Manual

Battery Replacement

Useful Equations and Conversions

Area equation for rectangular or square ducts
Area equation for circular ducts
Cubic equations
Unit of Measure Conversion Table
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When the LBT icon appears on the LCD, the 9V battery must be replaced.
1. Remove the rubber holster that surrounds the entire meter
2. Slide off the rear battery compartment
3. Replace the 9V battery
4. Affix the battery compartment cover and the meter holster
Height (H)
Width (W)
Radius
3
CFM (ft /min) = Air Velocity (ft/min) x Area (ft
3
CMM (m /min) = Air Velocity (m/sec) x Area (m
NOTE: Measurements made in inches
must be converted to feet or meters before using the above formulae.
m/s
1 m/s 1
1 ft/min 0.00508
1 knot 0.5144
1 km/h 0.2778
1 MPH 0.4464
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Area (A) = Width (W) x Height (H)
Area (A) = pi x r 2
Where pi = 3.14 and r 2
2
) x 60
ft/min knots km/h
196.87 1.944 3.6
1 0.00987 0.01829
101.27 1 1.8519
54.69 0.54
87.89 0.8679 1.6071
7
= radius x radius
2
)
MPH
2.24
0.01138
1.1523
1 0.6222
1
407113-EN v3.6 4/14
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