Operating Guide

Table 1. Emissivities of common materials
Material Emissivity Material Emissivity
Aluminum 0.30 Glass 0.90 to 0.95
Asphalt 0.95 Iron Oxides 0.78 to 0.82
Concrete 0.95 Paint 0.80 to 0.95
Asbestos 0.95 Plastic 0.85 to 0.95
Ceramics 0.95 Paper 0.70 to 0.94
Brass 0.50 Plaster 0.80 to 0.90
Brick 0.90 Rubber 0.95
Carbon 0.85 Wood 0.90
Sludge 0.94 Textile 0.94
Frozen Food 0.90 Lead 0.50
Hot Food 0.93 Marble 0.94
Ice 0.98 Cloth (black) 0.98
Snow 0.90 Sand 0.90
Human Skin 0.98 Water 0.93
MAKING ACCURATE MEASUREMENTS
The IRT102 has a distance-to-spot (D:S) ratio of 6:1. This
means that the target area (spot) whose infrared radiation
(temperature) is being measured increases in diameter by
1 inch for every 6 inches you move away from the target.
Conversely, the diameter of the target area measured
decreases by 1 inch for every 6 inches you move closer to
the target.
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IRT102 Manual 3-lang_FINAL2a-032614_awb 3/26/14 9:54 AM Page 6