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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
Height (H)
Width (W)
Area equation for circular ducts
Radius
Cubic equations
CFM (ft
3
/min) = Air Velocity (ft/min) x Area (ft
CMM (m
3
/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.
Unit of Measure Conversion Table
m/s
1 m/s
1
196.87
1 ft/min
0.00508
1 knot
0.5144
101.27
1 km/h
0.2778
1 MPH
0.4464
Area (A) = Width (W) x Height (H)
Area (A) =
6
x r
Where
6
= 3.14 and r
radius
ft/min
knots
km/h
1.944
3.6
1
0.00987
0.01829
1
1.8519
54.69
0.54
87.89
0.8679
1.6071
7
2
2
= radius x
2
)
2
) x 60
MPH
2.24
0.01138
1.1523
1
0.6222
1
Model 407113 V3.2 07/07
www.burntec.com
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