General IRT656 Manuel De L'utilisateur page 4

IRT656 Manual -2P-043008:Layout 1
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 (FOR REFERENCE)
Material
Gold (pure highly polished)
Aluminum Foil
Aluminum Disc
Aluminum Household (flat)
Aluminum (polished prate 98.3%)
Aluminum (rough plate)
Aluminum (oxidized @ 599°C)
Aluminum surfaced roofing
Tin (bright tinned iron sheet)
Nickel wire
4/30/08
Material
Lead (pure 99.95-unoxidized)
Copper
Steel
Zinc galvanized sheet iron (bright)
Brass (highly polished)
Brass (hard rolled-polished w/lines)
Iron galvanized (bright)
Iron plate (completely)
Rolled sheet steel
Oxidized iron
Wrought iron
Molten iron
Copper (polished)
Copper (scraped shiny not mirrored)
Cooper(plate heavily oxidized)
Enamel(white fused on iron)
Formica
Frozen oil
Brick(red-rough)
Brick (silica-unglazed rough)
Carbon (T-carbon 0.9% ash)
Concrete
Glass (smooth)
Granite (polished)
Temp °F/°C Emissivity
Ice
227/440 0.02
Marble (light gray polished)
27/81 0.04
Asbestos board
27/81 0.18
Asbestos paper
23/73 0.01
227/400 0.04
Asphalt (paving)
577/1070 0.06
26/78 0.06
199/390 0.11
599/1110 0.19
38/100 0.22
25/77 0.04
187/368 0.1
2:46 PM Page 4
Temp °F/°C
127/260
199/390
599/1110
199/390
599/1110
28/82
247/476
21/70
-
20/68
21/71
100/212
21/70
1299-1399/
3270-2550
21-117/70-242
22/72
25/77
19/66
27/81
-
21/70
1000/1832
127/260
-
22/72
21/70
0/32
22/72
23/74
38/100
371/700
4/39
Emissivity
0.06
0.18
0.19
0.52
0.57
0.23
0.03
0.04
0.13
0.69
0.66
0.74
0.94
0.29
0.02
0.07
0.78
0.9
0.94
0.93
0.93
0.8
0.81
0.94
0.94
0.85
0.97
0.93
0.96
0.93
0.95
0.97