LumaSense Technologies IN 5/5 - Handbuch (Seite 22)

INFRATHERM pyrometers IN 5 · IN 5/5
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8 Alignment of the instrument
For exact measurement of the object temperature the pyrometer must be aligned correctly onto the object.
The instruments are not equipped with a sighting so that the aligning must be done thermally. When measur-
ing a hot object in front of a cooler background, it usually suffices to align the pyrometer to achieve the
highest temperature reading.
9 Instrument settings
The emissivity of the measuring object and the and instrument’s exposure time can be set via controls in the
pyrometer housing.
The controls can be accessed by
removing the rear panel in the follow-
ing way:
1. Disconnect the electrical
connection
2. Unscrew the rear screws with a
2.5 mm allen screw
3. Take the cover off, making sure it
remains straight (without bending
or twisting it).
Assembling:
When reassembling the cover, insert it carefully into the guide pins and then fasten it with the screws. The
connector cable can now be plugged in.
9.1.1
Emissivity (EMI)
For a correct measurement it is necessary to adjust the emissivity. This emissivity is the
relationship between the emission of an 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 20 and 100%). Additionally the emissivity is
depending 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 two 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.
Note: The minimum emissivity setting for the pyrometer is 20%!
The settings will be done via the rotary switch.
Setting examples:
EMI =100%:
EMI = 85%:
Note: If the emissivity is set to an incorrect value (below 20%) the instrument will
automatically utilize an emissivity value of 100%. The setting 00 is interpreted as
EMI = 100%.
Settings:
100%
. . .
20%
Rotary switch
for emissivity
adjustment
Electrical
connection
Rear panel
Locking screws
(allen key,
2,5 mm)
Aligning support
(pin) for correct
mounting of the
rear panel
Controls