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Laserliner MultiWet-Master Manual

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MultiWet-Master
Material table - capacitive measurement
11
Softwood low-density woods: e.g. spruce, pine, limewood, poplar, cedar, mahogany
Hardwood higher-density woods: e.g. beech, oak, ash, birch
– place the conducting contacts completely on the material to be measured, pressing them down evenly
and lightly to achieve good contact
– measured surface should be free of dust and dirt
– keep at least a 5Ɓcm distance from metal objects
– metal pipes, electric lines and reinforcing steel can falsify measurement results
– make measurements at several locations on the surface
Due to the differing constitution and composition of materials, specific application notices are to be
followed for their moisture assessment:
Wood: The measurement should be made with the length of the device in parallel with the grain of
the wood. The measured depth in wood is 30Ɓmm maximum but does vary somewhat with differing
wood densities. Measurements made on thin wood boards should, if possible, be made on a stack of
these boards as otherwise the measurement will be too low. Measurements made on installed wooden
structures are influenced by the structural conditions and their chemical treatments (e.g. paints) with
various materials. Thus such measurements should only be viewed relatively. Nevertheless, the differences
in moisture distribution are very good for localising moist places as an indication of damage, e.g. in
insulation.
Greatest accuracy is reached between 6Ɓ% and 30Ɓ% material moisture. In very dry wood (< 6Ɓ%)
irregular moisture distribution can be detected, in very wet wood (> 30Ɓ%) saturation of the wood
Ö bres begins. Material relative moisture reference values, in %, for use with wood:
– Outdoor usage: 12Ɓ% … 19Ɓ%
– Use in unheated rooms: 12Ɓ% … 16Ɓ%
– In heated rooms (12 °C … 21 °C): 9Ɓ% … 13Ɓ%
– In heated rooms (> 21 °C): 6Ɓ% … 10Ɓ%
Example: 100% material moisture for 1Ɓkg of wet wood = 500Ɓg water.
Application notices
12
Determining material moisture
13
19
GB
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