RayTek Raynger Series 3i Plus Operating Instructions Manual page 58

Appendix
To optimize surface temperature measurements, consider the following guidelines:
• Determine the object emissivity using the instrument, which is also to be used for
measurements.
• Avoid reflections by shielding the object from surrounding temperature sources.
For higher temperature objects use instruments with the shortest wavelength possible.
•
• For translucent materials such as plastic foil or glass, ensure that the background is uniform
and lower in temperature than the object.
• Hold instrument perpendicular to surface whenever emissivity is less than 0.9. In all cases, do
not exceed angles more than 30 degrees from incidence.
For 1M and 2M models, avoid measurements in high ambient light conditions.
•
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Emissivity
Material
1 µm
Monel (Ni-Cu) 0.3
Oxidized
Nickel
Oxidized 0.8-0.9
Electrolytic 0.2-0.4
Platinum
Black
Silver
Steel
Cold-Rolled 0.8-0.9
Ground Sheet
Polished Sheet 0.35
Molten 0.35
Oxidized 0.8-0.9
Stainless 0.35
Tin (Unoxidized) 0.25
Titanium
Polished 0.5-0.75
Oxidized
Tungsten
Polished 0.35-0.4
Zinc
Oxidized 0.6
Polished 0.5
Table 8: Typical Emissivity Values
Rev. A1 Jan 2015
Metals
1.6 µm
0.2-0.6
0.4-0.7
0.1-0.3
0.95
0.02
0.8-0.9
0.25
0.25-0.4
0.8-0.9
0.2-0.9
0.1-0.3
0.3-0.5
0.6-0.8
0.1-0.3
0.15
0.05
3i Plus
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