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7. Setting emissivity (reference)
Quantity of infrared emitted radiation from objects depends on the objects’
material, surface conditions, measuring temperatures and so on. The table
below shows emissivity of some objects. Please note that these values are just
for reference. Please also refer to the estimated emissivity using the separately
sold black body tape MODEL8085.
Material
Emissivity
Material
Emissivity
Water, Ice
0.98
Cloth, Fabric (colored)
0.95
Soil
0.92 to 0.96
Leather, Fur
0.96
Concrete (wet)
0.96 to 0.98
Human skin
0.99
Concrete (dry)
0.91 to 0.95
Vegetable, Fruit
0.98
Ceramics
0.85 to 0.95
Dough
0.98
Stone, Asbestos
0.92
Meat
0.98
Plastics
0.90 to 0.95
Copper oxide
0.50 to 0.60
Rubber (black)
0.95
Ferric oxide
0.70 to 0.80
Wood
0.98
Painted surface
0.80
Paper
0.92
Tile
0.80
Estimated emissivity using the black body tape
If a measuring object accepts sticking of adhesive tape, stick a piece of the
black body tape (emissivity: 0.94) to the object, and measure the temperature
after setting the emissivity to 0.94.
* Black body is a substance which absorbs all incident radiation: no trans-
mission and no reflection, and would have an emissivity value of 1.
* Infrared thermometers can easily measure temperature from a distance with
safe. They can be
used for electrical or equipment maintenance, building
control and process monitoring and other applications.
7. Setting emissivity (reference)
