LumaSense Technologies IGA 15 plus - Handbuch (Seite 10)

IMPAC pyrometer IGA 15 plus
10
6 Parameter description / adjustments
6.1
EMI (emissivity
ε
)
For a correct measurement it is necessary to adjust the emissivity. 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 10 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 spectral range of the IGA 15 plus are listed below. The tolerance
of the emissivity values for each material is mainly dependent on the surface conditions. Rough
surfaces have higher emissivities.
Measuring object EMI (1.45...1.8 µm) Measuring object EMI (1.45...1.8 µm)
„Black body furnace“ 100% Zinc 45 to 55%
Steel heavily scaled 85 to 90% Nickel 15 to 20%
Steel rolling skin 80 to 88% Gold, Silver, bright 2%
Steel, molten 20 to 25% Porcelain glazed 60%
Slag 80 to 85% Porcelain rough 80 to 90%
Aluminum, bright 10% Graphite 80 to 90%
Chromium, bright 25 to 30% Fireclay 45 to 60%
Brass oxidized 60 to 70% Stoneware, glazed 80 to 90%
Bronze, bright 3% Brick 80 to 90%
Copper, oxidized 70 to 85% Soot 95%
6.2
MAX (maximum value)
The MAX function shows the highest reading taken during a measurement.
This feature is particularly useful for applications with fluctuating object temperatures or for the
measurement of moving objects which are not constantly in the measuring beam of the pyrometer.
With every new measurement the maximum value storage is cleared automatically, i.e. pushing
the trigger again.
Note: The response time of the pyrometer and with that the maximum value
storage function is faster than the update of the display.
6.3
MIN (minimum value)
The MIN function shows the lowest reading taken during a measurement.
Note: The response time of the pyrometer and with that the minimum value
storage function is faster than the update of the display.
6.4
AVG (average function)
The average function always shows the average of the readings of the last 4 seconds.