IF324_5A808_UK_M1
® Copyright CEAM Group
CEAM Control Equipment
16
Attention: this kind of damage, moreover quite frequent and typical, is not covered by the warranty.
Also the measurement on surfaces glossy, reflecting, chromium-plated, Aluminium, Bright Stainless Steel are
always very difficult to be done, and are not reliable, both for the nature of the materials, and also because of
the Emissivity constant, look at the paragraph Emissivity here below.
It is not possible to make measurements neither through mineral glass sheets, as this element operates on a
wave length different then the human eye, and if for the eye the glass is transparent, for this instrument it is
opaque as an Iron plate, then even if the laser pointer will go beyond it (its wave length allows it), the
instrument will be able to measure just the superficial temperature of the glass, and not over it.
Also Steam, Warm air, Smoke and similar cannot be measured, as they are not solid bodies, besides the
operator should keep attention in this kind of measurements, because drawing to much the instrument up you
could dirty the instrument and its optical side, producing measure errors, or even making it useless.
EMISSIVITY:
As already explained before, in the infrared temperature measurements, it is necessary to set a
constant which is named Emissivity and which is typical and specific for the various kinds of materials to be
measured. Here following it is published a summary table of Emissivity of the most common materials.
ATTENTION! In case you desire to measure with more accuracy all the materials, but in particular the most
difficult ones or even impossible ones to be measured, you can do it with a simple trick, in practice it is enough
to create some point of measure (TARGET) where the surface to be measured has been modified, or where
there is applied a piece of compatible material, for example some adhesive tape well stuck, or for higher
temperature it is possible to paint beforehand these points with opaque Black Paint, it is perfect the muffler
paint which you can find on the market in chip and practical Aerosol bombs, for further information and
suggestions contact the customer service CEAM , here following anyway we publish a short table with the
Emissivity values of the main materials families
EMISSIVITY COEFFICIENT TABLE
Material
Emissivity
Material
Emissivity
Asphalt
0.90 ÷ 0.98
Cloth
0.98
Concrete
0.94
Human Skin
0.98
Cement
0.96
Leather
0.75 ÷ 0.80
Sand
0.90
Coal (Powder)
0.96
Land
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
Wood
0.90
Glass
0.90 ÷ 0.95
Plastic
0.85 ÷ 0.95
Ceramics
0.90
Paper
0.70 ÷ 0.94
Marble
0.94
Oxidized Chrome Steel
0.81
Gypsum
0.80 ÷ 0.90
Oxidized Copper
0.78
Malta
0.89 ÷ 0.91
Oxidized Steel
0.78 ÷ 0.82
Brick
0.93 ÷ 0.96
Fabric
0.90
Other eventual material get by experimental way
Material
Emissivity
Material
Emissivity
Summary of Contents for IF324
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