Extech Instruments 42510A User Manual page 7

Emissivity and IR Measurement Theory
Emissivity Factors for Common Materials
Battery Replacement
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IR Thermometers measure the surface temperature of an object. The thermometer's optics sense
emitted, reflected, and transmitted energy. The thermometer's electronics translate the information
into a temperature reading which is then displayed on the LCD.
The amount of IR energy emitted by an object is proportional to an object's temperature and its
ability to emit energy. This ability is known as emissivity and is based upon the material of the object
and its surface finish. Emissivity values range from 0.1 for a very reflective object to 1.00 for a flat
black finish. For the Model 42510A, the emissivity is adjustable from 0.1 to 1.00. Most organic
materials and painted or oxidized surfaces have an emissivity factor of 0.95. When in doubt, set the
emissivity to 0.95.
Material under test
Asphalt
Concrete
Cement
Sand
Soil
Water
Ice
Snow
Glass
Ceramic
Marble
Plaster
Mortar
Brick
When the low battery symbol
battery (9V). The battery compartment is located behind the panel that surrounds
the meter's trigger. Open the compartment by pulling the panel down from the
trigger area. Replace the 9V battery and close the battery compartment cover.
You, as the end user, are legally bound (EU Battery ordinance) to
return all used batteries, disposal in the household garbage is
prohibited! You can hand over your used batteries / accumulators at
collection points in your community or wherever batteries /
accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal
of the device at the end of its lifecycle
.com
Emissivity Material under test
0.90 to 0.98 Cloth (black)
0.94 Skin (human)
0.96 Leather
0.90 Charcoal (powder)
0.92 to 0.96 Lacquer
0.92 to 0.96 Lacquer (matt)
0.96 to 0.98 Rubber (black)
0.83 Plastic
0.90 to 0.95 Timber
0.90 to 0.94 Paper
0.94 Chromium Oxides
0.80 to 0.90 Copper Oxides
0.89 to 0.91 Iron Oxides
0.93 to 0.96 Textiles
appears on the display, replace the meter's
7
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Emissivity
0.98
0.98
0.75 to 0.80
0.96
0.80 to 0.95
0.97
0.94
0.85 to 0.95
0.90
0.70 to 0.94
0.81
0.78
0.78 to 0.82
0.90
42510A-EU-EN-V3.4 4/13
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