FLIR Extech Instruments 42510A User Manual page 7

Emissivity and IR Measurement Theory
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.
Emissivity Factors for Common Materials
Material under test
Asphalt
Concrete
Cement
Sand
Soil
Water
Ice
Snow
Glass
Ceramic
Marble
Plaster
Mortar
Brick
Battery Replacement
When the low battery symbol
meter's 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
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
7
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-V3.3-9/10