15
SKF TKTI 10
4.4.1 Menu Infrared Settings
Infrared
Settings
•
Emissivity
Different surfaces can radiate different amounts of infrared energy at the
same temperature. This difference in temperature measurement can be
corrected for by setting the emissivity value.
The amount of infrared radiation emitted by a surface depends on both
its temperature and its emissivity. Surfaces that are good reflectors (e.g.
polished metal) are poor emitters, and surfaces that are good emitters
(e.g. human skin) are poor reflectors. A black body is defined as an
object that absorbs all radiation falling on it; and it is a perfect emitter of
radiation.
The emissivity of a surface (usually written
ε
) is the ratio of energy
radiated by that surface to energy radiated by a black body at the same
temperature. For accurate temperature measurements, the emissivity of
the surface being measured must be entered into the camera. This is done
by entering a number in the range 0.10 (for polished chromium) to 1.00
(for a black body). An emissivity lookup table is provided, which lists the
emissivities of a range of common materials.
It is not recommended that temperature measurements be attempted
when emissivity values lower than 0.70 are required, because large errors
are likely due to reflected radiation from surrounding objects.
Set emissivity value between 0.10 and 1.00 for measuring temperature.
Pressing Direct access button 3 (
ε
Table) gives a table of emissivity values
of common materials from which a selection can be made.
Summary of Contents for TKTI 10
Page 1: ...Instructions for use SKF TKTI 10...
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Page 30: ...MP5357A SKF TKTI 10...
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