LumaSense Technologies IS 8-GS pro - Manual (Page 19)

Series 8 pro Manual Settings / parameter descriptions 19
5 Parameter descriptions / Settings
The pyrometer is equipped with a wide range of settings for optimal adaptation to the required
measuring condition and to measure the temperature correctly.
5.1 Emissivity
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 three 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 [%]
Measuring object
Emissivity [%]
IS 8 plus
IS 8-K plus
(0.78...1.1 µm)
IGA 8 plus
(1.45...1.8 µm)
IS 8 plus
IS 8-K plus
(0.78...1.1 µm)
IGA 8 plus
(1.45...1.8 µm)
“Blackbody
furnace“
100 100 Porcelain glazed 60 60
Steel heavily
scaled
93 85...90 Porcelain rough 80...90 80...90
Steel rolling
skin
88 80...88 Graphite 80...92 80...90
Steel, molten 30 20...25 Refractory bricks 45...60 45...60
Slag 85 80...85 Earthenware, glazed 86...90 80...90
Aluminum,
bright
15 10 Brick 85...90 80...90
Chromium,
bright
28...32 25...30 Soot 95 95
Brass oxidized
(tarnished)
65...75 60...70
Bronze, bright 3 3
Measuring object
Emissivity [%]
IS 8-GS plus
(0.55 µm)
Copper,
oxidized
88 70...85
Zinc 58 45...55 Cast iron (liquid) 40...50
Nickel 22 15...20 Steel (liquid) 20...50
Gold, Silver,
bright
2 2
Melted non-iron
metal
30...50