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The measuring tool's emissivity presets are guide values.
You can select one of the emisssivity presets or enter an exact numerical value. To set the desired emissivity,
navigate to 'Measurement' → 'Emissivity'. → page 37
Correct temperature measurements are possible only when the set emissivity and the emissivity of the
object match.
The lower the emissivity, the greater is the influence of reflected temperature on the measured result.
Consequently, whenever emissivity changes you must always adjust the reflected temperature accordingly.
To set the reflected temperature, navigate to 'Measurement' → 'Reflected Temp.'. → page 37 → page 37
Apparent temperature differences shown by the measuring tool might be due to different temperatures
and/or different emissivities. If emissivities differ strongly, the temperature differences shown by the tool
might vary considerably from the real differences.
If there are two or more objects of different materials or different structure in the measured area, the
temperature values displayed by the tool are accurate only for the object or objects for which the emissivity
setting is correct. For all the other objects (with different emissivities), the color differences can be used as
indicators for temperature relationships.
6.3.1
Emissivity table
This table serves as a guide for setting emissivity. It tabulates the emissivity ε of some common materials.
Emissivity varies with temperature and surface condition, so the values stated here should be considered
only as guide values for the measurement of temperature ratios or temperature differences. The emissivity of
the material has to be determined exactly in order for the absolute value of the temperature to be measured.
Material (material temperature)
Aluminum, bright rolled
Aluminum, not oxidized
Aluminum, not oxidized
Aluminum, strongly oxidized
Aluminum, highly polished
Cotton
Concrete
Lead
Lead, oxidized
Lead, gray oxidized
Chrome
Chrome, polished
Ice, smooth
Iron, ground down
Iron with casting skin
Iron with rolling skin
Glass
Gypsum
Granite
Rubber, hard
Rubber, soft, gray
Cast iron, oxidized
Wood
Cork
Heat sink, black, anodized
Copper, slightly tarnished
Copper, oxidized
Copper, polished
Copper, rolled
34
English
Material temperature
170 ℃
25 ℃
100 ℃
93 ℃
100 ℃
20 ℃
25 ℃
40 ℃
40 ℃
40 ℃
40 ℃
150 ℃
0 ℃
20 ℃
100 ℃
20 ℃
90 ℃
20 ℃
20 ℃
23 ℃
23 ℃
200 ℃
70 ℃
20 ℃
50 ℃
20 ℃
130 ℃
40 ℃
40 ℃
2356162
*2356162*
Emissivity ε
0.04
0.02
0.03
0.2
0.09
0.77
0.93
0.43
0.43
0.28
0.08
0.06
0.97
0.24
0.8
0.77
0.9
0.94
0.45
0.94
0.89
0.64
0.94
0.7
0.98
0.04
0.76
0.03
0.64
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