LumaSense IS 12 User Manual

IS 12 / IGA 12 Manual Settings / Parameter Descriptions • 27
5 Parameter Descriptions / Settings
5.1 Emissivity ε
For a correct measurement, it is necessary to adjust the emissivity. The emissivity is the
relationship between the emission of a real object and the emission of a blackbody radiation
source (this is an object which absorbs all incoming rays and has an emissivity of 100%) at the
same temperature.
Different materials have different emissivities ranging between 0% and 100% (settings at the
pyrometer between 10 and 100%, the set value is indicated on the display). Additionally, the
emissivity is dependent on the surface condition of the material, the spectral range of the
pyrometer, and the measuring temperature. The emissivity setting of the pyrometer has to be
adjusted accordingly.
Typical emissivity values of various common materials for the two spectral ranges of the
instruments are listed below. The tolerance of the emissivity values for each material is mainly
dependent on the surface conditions. Rough surfaces have higher emissivities.
Measuring object
Emissivity [%]
(at 0.7 to 1.1 µm)
(at 1.45 to 1.8 µm)
“Black body furnace“
100
100
Steel heavily scaled
93
85 to 90
Steel rolling skin
88
80 to 88
Steel, molten
30
20 to 25
Slag
85
80 to 85
Aluminum, bright
15
10
Chromium, bright
28 to 32
25 to 30
Brass oxidized (tarnished)
65 to 75
60 to 70
Bronze, bright
3
3
Copper, oxidized
88
70 to 85
Zinc
58
45 to 55
Nickel
22
15 to 20
Gold, Silver, bright
2
2
Porcelain glazed
60
60
Porcelain rough
80 to 90
80 to 90
Graphite
80 to 92
80 to 90
Fireclay
45 to 60
45 to 60
Stoneware, glazed
86 to 90
80 to 90
Brick
85 to 90
80 to 90
Soot
95
95
5.2 Exposure Time (t
90
)
The exposure time is the time interval when the measured temperature has
to be present after an abrupt change so that the output value of the
pyrometer reaches a given measurement value. The time taken is to reach
90% of the recorded temperature difference. In the “0.00” position, the
device operates using its time constant. The dynamic exposition time
adjustment prolongs the exposure time at the lower range limit.
Settings:
0.00 s
0.01 s
0.05 s
.
.
.
10.00 s

LumaSense IS 12 Specifications

General

Brand	LumaSense
Model	IS 12
Category	Measuring Instruments
Language	English