Lumasense-technologies IN 300/5 Manual de usuario descargar pdf (Pagina 19)

IMPAC pyrometers IN 300 · IN 300/5

6 Emissivity

For a correct measurement it is necessary to adjust the emissivity ε. This emissivity is the relation-

ship 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 tempera-

ture. Different materials have different emissivities ranging between 0% and 100% (settings at the

pyrometer between 40 and 100%). Additionally the emissivity is depending on the surface condi-

tion 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 in the emissiv-

ity table below. The tolerance of the emissivity values for each material is mainly dependent on the

surface conditions. Rough surfaces have higher emissivities.

Note:

The pyrometer is set ex works to an emissivity of 100%.

To adjust the emissivity factor to your own purpose,

you have to remove the rear cover by unscrew the

locking screw. Remove the cover carefully. In the

tube there is a scale that can be turned with a small

screwdriver. Adjust the emissivity factor to your

desire. After that, push the cable carefully back in

the tube, put the cover on the tube and tighten the

locking screw for the cover.

The following table may give a first information of the correct setting of the emissivity. For exact

measurement we recommend a comparison measurement with a contact thermometer (e.g.

Tastotherm MP 2000 with a suited probe).

6.1 Emissivity table

Measuring object ε (at 8 ... 14 µm) Measuring object ε (at 8 ... 14 µm)

"Black body furnace" 100% Brickwork

Human skin 98% Fire clay

Black dull varnish 95% Rubber

Carbon soot 95% Porcelain

Wood 80 ... 92% Ceramics

Paper 92 ... 95% Varnish

Asphalt 85% Plaster

Glass / quartz glass 72 ... 87% Oil paint

85 ... 95%

Textile 75 ... 95% Steel (oxidized) 60 ... 80%

Graphite 75 ... 92% Steel (smooth) 10 ... 30%

Cement 90% Aluminium (smooth) 2 ... 15%

Water 95% Aluminium (anodized) 96%

Measuring object ε (at 5.14 µm)

Glass / quartz glass 97%

Potentiometer

for emissivity

adjustment

Locking screw

for rear cover

Rear cover

1 2 ... 14 15 16 17 18 19 20 21 22 23 24

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Lumasense-technologies IN 300/5 Manual de usuario Pagina 19

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