Useful Equations And Conversions - Extech Instruments 407113 User Manual

Battery Replacement
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

Useful Equations and Conversions

Area equation for rectangular or square ducts
Width (W)
Area equation for circular ducts
Cubic equations
CMM (m
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
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Height (H)
Radius
3
CFM (ft /min) = Air Velocity (ft/min) x Area (ft
3 /min) = Air Velocity (m/sec) x Area (m
NOTE: Measurements made in inches
m/s ft/min
1 196.87
0.00508 1
0.5144 101.27
0.2778 54.69
0.4464 87.89
Area (A) = Width (W) x Height (H)
2
Area (A) = pi x r
Where pi = 3.14 and r
knots
1.944
0.00987 0.01829
1 1.8519
0.54
0.8679 1.6071
7
2
= radius x radius
2
)
2 ) x 60
km/h MPH
3.6 2.24
0.01138
1.1523
1 0.6222
1
407113-EN v3.6 4/14
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