General Tools and Instruments IRT653 User Manual
Page 5
EMISSIVITY:
Emissivity is the ability of an object to omit or absorb energy.
Perfect emitters have an emissivity of 1, emitting 100% of
incident energy.
An object with an emissivity of 0.8 will absorb 80% and
reflect 20% of the incident energy. Emissivity is defined as
the ratio of the energy radiated by an object at a given
temperature to the energy emitted by a perfect radiator at
the same temperature. All values of emissivity fall between
0.0 and 1.0.
Non-contact temperature sensors measure IR energy emitted
by the target, have fast response, and are commonly used to
measure moving and intermittent targets, targets in a
vacuum, and targets that inaccessible due to hostile
environments, geometry limitations, or safety hazard.
The cost is relatively higher, although in some cases it is
comparable to contact devises.
MAINTENANCE:
Cleaning the lens: Blow off loose particles using clean
compressed air. Gently brush remaining debris away with a
camel’s hair brush. Carefully wipe the surface with a moist
cotton swab. The swab may be moistened with water.
NOTE: DO NOT use solvents to clean the lens.
CLEANING THE HOUSING: Use soap and water on a damp
sponge or soft cloth.
EMISSIVITY TABLE
Material
Temp °F/°C
Emissivity
Gold (pure highly polished)
227/440
0.02
Aluminum Foil
27/81
0.04
Aluminum Disc
27/81
0.18
Aluminum Household(flat)
23/73
0.01
Aluminum(polished prate 98.3%)
227/400
0.04
577/1070
0.06
Aluminum (rough plate)
26/78
0.06
Aluminum (oxidized @ 599°C)
199/390
0.11
599/1110
0.19
Aluminum surfaced roofing
38/100
0.22
Tin(bright tinned iron sheet)
25/77
0.04
Material
Temp °F/°C
Emissivity
Nickel wire
187/368
0.1
Lead (pure 99.95-unoxidized)
127/260
0.06
Copper
199/390
0.18
599/1110
0.19
Steel
199/390
0.52
599/1110
0.57
Zinc galvanized sheet iron (bright)
28/82
0.23
Brass (highly polished)
247/476
0.03
Brass (hard rolled-polished w/lines)
21/70
0.04
Iron galvanized (bright)
-
0.13
Iron plate (completely)
20/68
0.69
Rolled sheet steel
21/71
0.66
Oxidized iron
100/212
0.74
Wrought iron
21/70
0.94
Molten iron
1299-1399/
0.29
3270-2550
Copper (polished)
21-117/70-242
0.02
Copper (scraped shiny not mirrored)
22/72
0.07
Cooper (plate heavily oxidized)
25/77
0.78
Enamel (white fused on iron)
19/66
0.9
Formica
27/81
0.94
Frozen oil
-
0.93
Brick (red-rough)
21/70
0.93
Brick (silica-unglazed rough)
1000/1832
0.8
Carbon (T-carbon 0.9% ash)
127/260
0.81
Concrete
-
0.94
Glass (smooth)
22/72
0.94
Granite (polished)
21/70
0.85
Ice
0/32
0.97
Marble (light gray polished)
22/72
0.93
Asbestos board
23/74
0.96
Asbestos paper
38/100
0.93
371/700
0.95
Asphalt (paving)
4/39
0.97
IRT653 Manual -2P-043008:Layout 1 4/30/08 12:29 PM Page 5