14
12. Emissivity
The emissivity of the surface of a material is its effectiveness in emitting energy as thermal
radiation. The emissivity of the product can be adjusted from 0.10 to 1.00 with the default
value of 0.95. Many common objects and materials (such as timber, water, skin and textile
fabric) can reflect the heat energy effectively, so it is easy to obtain relatively correct
measurement value.
Correct setting of the emissivity value of different objects and materials is very important for
carrying out the most accurate temperature measurement. The surface emissivity will produce
giant impact on surface temperature measured by the product.
13. The Table of Emissivity Value
The product is provided with four types of object measurement modes:
1. Coarse object (easy to give out energy)(0.95);
2. Semi-matte object (0.80);
3. Semi-shiny object (0.60);
4. Shiny object (0.30);
Substance
Thermal radiation
Substance
Thermal radiation
Bitumen
0.90-0.98
Black cloth
0.98
Concrete
0.94
Human skin
0.98
Cement
0.96
Foam
0.75-0.80
Sand
0.90
Charcoal dust
0.96
Earth
0.92-0.96
Paint
0.80-0.95
Water
0.92-0.96
Matte paint
0.97
Ice
0.96-0.98
Black rubber
0.94
Snow
0.83
Plastic
0.85-0.95
Glass
0.90-0.95
Timber
0.90
Ceramics
0.90-0.94
Paper
0.70-0.94
Marble
0.94
Chromium
hemitrioxide
0.81
Gypsum
0.80-0.90
Copper oxide
0.78
Mortar
0.89-0.91
Ferric oxide
0.78-0.82
Brick
0.93-0.96
Textile
0.90
