LumaSense Technologies IS 50-LO plus - Manual (Page 21)

IS 50-LO plus / IGA 50-LO plus Manual Parameter descriptions / settings 21
5 Parameter descriptions / Settings
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 50-LO
plus
(at 0.9 µm)
IGA 50-LO
plus
(at 1.6 µm)
IS 50-LO
plus
(at 0.9 µm)
IGA 50-LO
plus
(at 1.6 µm)
„Black body
furnace“
100 100
Zinc
58 45...55
Steel heavily scaled 93 85...90 Nickel 22 15...20
Steel rolling skin 88 80...88 Gold, Silver, bright 2 2
Steel, molten 30 20...25 Porcelain glazed 60 60
Slag 85 80...85 Porcelain rough 80...90 80...90
Aluminum, bright 15 10 Graphite 80...92 80...90
Chromium, bright 28...32 25...30 Chamotte 45...60 45...60
Brass oxidized
(tarnished)
65...75 60...70
Earthenware,
glazed
86...90 80...90
Bronze, bright 3 3 Brick 85...90 80...90
Copper, oxidized 88 70...85 Soot 95 95
Emissivity values for the IS 50-Al-LO plus are listed below:
Measuring object Emissivity [%]
Aluminium, polished surface 14 (360 ... 500 °C) 14 (> 500 °C)
Aluminium, smooth surface 30 ... 36 (360 ... 500 °C) 30 ... 36 (> 500 °C)
Silicon 67 (360 ... 800 °C) 27 (1400 °C)
Emissivity values for the IS 50-Si-LO plus are listed below:
Measuring object Emissivity [%]
Silicon 67 (360 ... 800 °C) 27 (1400 °C)
Display
of the
adjusted
emissivity