5
Emissivity
•
Emissivity describes the energy-emitting characteristics of materials. Most organic
materials and painted or oxidized surfaces have an emissivity of about 0.95.
•
If possible, to compensate for inaccurate readings that may result from measuring
shiny metal surfaces, cover the surface to be measured with masking tape or flat
black paint (<150
o
C / 302
o
F) and use the high emissivity setting. Allow time for the
tape or paint to reach the same temperatures as the surface beneath it. Measure
the temperature of the tape or painted surface.
•
If you cannot use paint or use tape, then you could improve the accuracy of your
measurements with the emissivity selector. Even with emissivity selector, it can be
difficult to get a completely accurate infrared measurement of a target with a shiny
or metallic surface.
•
The Thermometer allows you to adjust the unit’s emissivity for the type of surface.
To adjust values for emissivity (see table below):
1.
Press SET to select emissivity set up, icon E on the display will flash. The
Thermometer steps through emissivity set up, trigger lock and switching
o
C /
o
F.
2.
Press
▲
to increase the value by 0.01 or press and hold
▲
to access quick setting.
The maximum value is 1.00.
3.
Press
▼
to decrease the value by 0.0
1
or press and hold
▼
to access quick
setting.
The minimum value is 0.10.
Measure Surface (metals)
Switch Setting
Aluminium oxydised
0.2-0.4
Alloy A3003 oxydised
0.3
Alloy A3003 roughened
0.1-0.3
Burnished Brass
0.3
Oxidised Brass
0.5
Copper oxydised
0.4-0.8
Electrical terminal blocks
0.6
Haynes alloy
0.3-0.8
Inconel oxydised
0.7-0.95
Inconel sandblasted
0.3-0.6
Inconel electropolished
0.15
Cast Iron oxydised
0.6-0.95
Cast Iron clean
0.2
Cast Iron molten
0.2-0.3
Wrought Iron dull
0.9
Lead rough cast
0.4
Lead oxydised
0.2-0.6
Molydbenum oxydised
0.2-0.6
Nickel oxydised
0.2-0.5
Platinum black
0.9
Steel cold rolled
0.7-0.9
Steel ground sheet
0.4-0.6
Steel polished sheet
0.1
Iron oxydised
0.5-0.9
Iron rusted
0.5-0.7
Zinc oxydised
0.1
