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Emissivity
Emissivity is a term used to describe the energy-emitting characteristics
of materials.
Most (90% of typical applications) organic materials and painted or
oxidized surfaces have an emissivity of 0.95 (pre-set in the unit).
Inaccurate readings will result from measuring shiny or polished
metal surfaces. To compensate, cover the surface to be measured
with masking tape or flat black paint. Allow time for the tape to
reach the same temperature as the material underneath it. Measure
the temperature of the tape or painted surface.
8. Emissivity Values
9. Maintenance
•Repairs or service are not covered in this manual and should only
be carried out by qualified trained technician.
•Periodically, wipe the body with a dry cloth. Do not use abrasives
or solvents on this instrument.
•For service, use only manufacturer's specified parts.
Substance
Asphalt
Concrete
Cement
Sand
Earth
Water
Ice
Snow
Glass
Ceramic
Marble
Plaster
Mortar
Brick
Thermal emissivity
0.90 to 0.98
0.94
0.96
0.90
0.92 to 0.96
0.92 to 0.96
0.96 to 0.98
0.83
0.90 to 0.95
0.90 to 0.94
0.94
0.80 to 0.90
0.89 to 0.91
0.93 to 0.96
Substance
Cloth (black)
Human skin
Lather
Charcoal (powder)
Lacquer
Lacquer (matt)
Rubber (black)
Plastic
Timber
Paper
Chromium oxides
Copper oxides
Iron oxides
Textiles
Thermal emissivity
0.98
0.98
0.75 to 0.80
0.96
0.80 to 0.95
0.97
0.94
0.85 to 0.95
0.90
0.70 to 0.94
0.81
0.78
0.78 to 0.82
0.90
EN 20
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