LumaSense Technologies IN 520 - Manual (Page 21)

Series IN 500 Operating Manual Device Settings 21
4 Device Settings
4.1 Parameters
The setting of the parameters of the IN 510-N or IN 520-N can only be done via serial interface
(see section 4.3 Settings with HT 6000 (accessory)), the parameters of the IN 510 and
IN 520 additionally can be done using the integrated push buttons inside the converter (see
section 4.2 Settings at the instrument).
4.1.1 Emissivity (EMI)
For a correct measurement, it is necessary to adjust the emissivity. This emissivity is the
relationship between the emission of a real object and the emission of a black body 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%, an additional attenuation, setting from 100 to 120% can be
used for example to correct the measurement of objects behind gases with hot soot).
Additionally, the emissivity is dependent upon 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 spectral range 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.
Object Emissivity (%) Object
Emissivity
(%)
" Black body furnace " 100 Brickwork
Human skin 98 Fire clay
Black dull varnish 95 Rubber
Carbon soot 95 Porcelain 85 ... 95
Wood 80 ... 92 Ceramics
Paper 92 ... 95 Varnish
Asphalt 85 Plaster
Glass / Quartz glass 72 ... 87 Oil paint
Textile 75 ... 95 Steel (oxidized) 60 ... 80
Graphite 75 ... 92 Steel (smooth) 10 ... 30
Cement 90 Aluminum (smooth) 2 ... 15
Water 95 Aluminum (anodized) 96