6 Using the product
43
Emissivity
You can choose between user-defined emissivity and 8 materials
with set emissivity. The reflected temperature (RTC) can be set
individually.
Emissivity information:
The emissivity describes the capability of a body to emit
electromagnetic radiation. This is material-specific and must be
adapted for correct measurement results.
Non-metals (paper, ceramic, gypsum, wood, paints and coatings),
plastics and food have high emissivity, which means that the
surface temperature can be easily measured using infrared.
Because of their low or non-uniform emissivity, bright metals and
metal oxides only have limited suitability for infrared measurement.
Highly inaccurate measurements should be expected. A remedy for
this is coatings that increase emissivity, e.g. paint or emission
adhesive (accessory, 0554 0051), which must be applied to the
object to be measured.
The following table gives typical emissivities of important materials.
These values can be used as a guide for user-defined settings.
Material (material temperature) Emissivity
Aluminium, bright rolled (170°C) 0.04
Cotton (20°C) 0.77
Concrete (25°C) 0.93
Ice, smooth (0°C) 0.97
Iron, emery ground (20°C) 0.24
Iron with casting skin (20°C) 0.80
Iron with rolling skin (20°C) 0.77
Gypsum (20°C) 0.90
Glass (90°C) 0.94
Rubber, hard (23°C) 0.94
Rubber, soft grey (23°C) 0.89
Wood (70°C) 0.94
Cork (20°C) 0.70
Radiator, black anodised (50°C) 0.98
Copper, slightly tarnished (20°C) 0.04
Copper, oxidized (130°C) 0.76
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