LumaSense Technologies IGA 740 - Manual (Page 23)

Operation of the pyrometer
KLEIBER 740 19
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object
justed at the pyrometer.
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7.2 Adjusting the Parameters
Emissivity
The emissivity is the relationship between infrared energy radiated from an object an
radiation energy of a perfect emitter (black emitter) at the same temperature and the same
ectral range.
e emissivity is material-dependent and of a considerable size in order to be able to
termine the temperature of an object accurately without contact. The emissivity of the
being measured must therefore be known and be ad
the emissivity suitable for the measurement in accordance with the procedural steps
e 19. The adjusted emission value is indicated in the main menu.
Typical emissivities for various ma
www.kleiberinfrared.com under practical knowledge or in relevant literature.
The instrument is calibrated at black body radiation (ε = 1.00). Real objects have an
emissivity less than 1.0. This difference can be stepless adjusted between 0.1 and 1.0 with
the potentiometer at the back of the instrument.
ow to find out correct emissivity: H
measuring object with a contact thermometer
e.g. thermocouple or resistance probes. The “black” temperature (spectral
temperature) measured with a pyrometer adjusted to emissivity = 1.0 usually gives
eas v di g l b e m it
<1.0. The value given by the instrument usually will be less than the real
per . T m n r of materials depends on temperature as well
ure scales, if you adjust the pyrometer at
of the potentiometer of emissivity.
After adjusting the emissivity factor through a correlation measurement you can now
measure temperatures for the calibrated temperature range at an accuracy
mentioned in the technical data.
1. First measure the real temperature of
a m uring alue fferin to rea temperature ecause of th real e issiv y of
tem ature he e issio atio most
as wave length being measured.
2. You can get a correlation of the temperat
the exact temperature with the help
IMPORTANT
Please pay attention if you take over table values of emissivity to give the value of
emissivity factor at a certain wave length. Adjusting emissivity following table values is not
as exactly as adjusting following a comparing measurement.
Changing emissivity
With the help of a suitable screw driver and without any violence you can adjust emissivity
at the rear side with the potentiometer (see Fig. 5) stepless between 0.1 and 1.