Lumasense-technologies IN 520 Manual de usuario descargar pdf (Pagina 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

Fire clay

Black dull varnish

Rubber

Carbon soot

Porcelain

85 ... 95

Wood

80 ... 92

Ceramics

Paper

92 ... 95

Varnish

Asphalt

Plast

Glass / Quartz glass

72 ... 87

Oil paint

Textile

75 ... 95

Steel (oxidized)

60 ... 80

Graphite

75 ... 92

Steel (smooth)

10 ... 30

Cement

Aluminum (smooth)

2 ... 15

Water

Aluminum (anodized)

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 37 38

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Lumasense-technologies IN 520 Manual de usuario Pagina 21

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