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Make sure that the measured target is larger than the spot size. The smaller the target, the
closer the test distance should be (please refer to D:S for the spot size at different distances).
To obtain the optimum measurement result, it is recommended that the target being measured
is 2 times larger than the spot size.
Emissivity is a symbol of the energy radiation of a material. The emissivity of most organic
materials and coated or oxidized surfaces is about 0.95. To measure the temperature of a bright
metal surface, cover the surface to be tested with masking tape or matt black paint with a high
emissivity setting (if it is possible), wait for a period of time, and measure the temperature of the
tape or black paint surface when it reaches the same temperature on the surface of the object
covered below. The total emissivity of some metals and non-metals are listed in the following
table.
Measured Surfaces
Metal
Aluminum
A3003Alloy
Brass
Copper
Hastelloy
lnconel
Iron
FIELD OF VIEW
Average
Good
Target>spot size
Target=spot size
EMISSIVITY
Oxidization
Oxidization
Rough
Burnishing
Oxidization
Oxidization
Electric Terminal Board
Alloy
Oxidization Sand-Blasting
Electro Burnishing
Oxidization
Rusting
Poor
Target<spot size
Emissivity
0.2-0.4
0.3
0.1-0.3
0.3
0.5
0.4-0.8
0.6
0.3-0.8
0.7-0.95
0.3-0.6
0.15
0.5-0.9
0.5-0.7
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