Eurotron IRtec Rayomatic 14 MK2, Instruction Manual, Page: 60 / 61

Instruction manual MM850618 ed. 01e
60
A2.3 Non-Metals - Typical Emissivity Values
1.0 µm 2.2 µm 5.1 µm 8-14 µm
Asbestos
0.9 0.8 0.9 0.95
Asphalt — — 0.95 0.95
Basalt — — 0.7 0.7
Carborundum — 0.95 0.9 0.9
Ceramic 0.4 0.8-0.95 0.85-0.95 0.95
Clay — 0.8-0.95 0.85-0.95 0.95
Concrete 0.65 0.9 0.9 0.95
Cloth — — 0 95 0.95
Glass
Plate
— 0.2 0.98 0.85
"Gob" — 0.4-0.9 0.9
Gravel — — 0.95 0.95
Gypsum — — 0.4-0.97 0.8-0.95
Ice — — — 0.98
Limestone — — 0.4-0.98 0.98
Paint 0.9-0.95
Paper (any colour) — — 0.95 0.9S
Plastic (opaque, — — 0.95 0.95
over 20 mils)
Rubber —
— 0.9 0 95
Sand — — 0.9 0.9
Snow — — 0.9
Soil — — — 0.9-0.98
Water — — — 0.93
Wood, Natural — — 0.9-0.95 0.9-0.95
To optimize surface temperature measurements consider the following guidelines:
1. Determine the object emissivity using the instrument to be used for the measurement.
2. Avoid reflections by shielding the object from surrounding high temperature sources.
3. For Higher temperature objects use shorter wavelength instruments, whenever any overlap occurs.
4. For semi-transparent materials such as plastic films and glasses, assure that the background is uniform and lower in temperature than
the object.
5. Mount the sensor perpendicular to the surface whenever the emissivity is less than 0.9. In any case, do not exceed angles more than
30 degrees from incidence.