Transmittance - KPM PROCESS SENSORS METIS M308 User Manual

due to material-dependent
conditions, as in metals
additionally to the surface
texture alloy components
play an important role for
the emissivity.
▪ Is a range given, this is
related to differences in
the nature of the sur-
face from smooth to
rough, rough surfaces
have higher emissivities
(for determining the cor-
rect emissivity also a
comparison measure-
ment can be performed
with a thermocouple).
▪ The emissivities with
"shiny" refer to applica-
tions that are performed
under an inert gas or in
a vacuum.
▪ "n.s." (not specified)
means that no values
exist for this wavelength
range e.g. because a
reasonable measure-
ment in this wavelength
or temperature range is
not possible.
Measurement deviations at a 10% false set
emissivity at a temperature of 700°C:
Materials has a maximum emissivity of 1 (100%). However, a setting of up to 1.2 can be used to compensate
for temperature corrections due to higher background reflection.
To determine the correct emissivity, also a comparative measurement with a thermocouple can be performed.
|INFO|
Emissivity, transmittance and spot size fill factor are directly related to each other, the result of the mul-
tiplication of the 3 parameters has to be minimum 5%. If the multiplication of the 3 parameters falls below 5%,
the values are displayed in red in the SensorTools control window (see 7.3.1).

6.3.4 Transmittance

Is a viewing window located between measuring object and pyrometer, the transmittance of the window must
be considered during the measurement. Enter the transmittance of the window in order to obtain a correct
measurement result.
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METIS M308 / M309 / M313 / M316 / M318 / H309 / H316 / H318 (12-pin)
Iron, oxidized
Graphite
Gold, shiny
Inconel, shiny
Inconel, oxidized
Copper, shiny
Copper, oxidized
Magnesium, shiny
Magnesium, oxidized
Brass, shiny
Brass, oxidized
Molybdenum, oxidized
Nickel
Porcelain, glazed
Porcelain, rough
Platinum
Soot
Chamotte
Slag
Silver, shiny
Silver, oxidized
Steel, shiny
Steel, oxidized
Steel, rolled
Stoneware, glazed
Stainless steel
Titanium, shiny
Titanium, oxidized
Tungsten, shiny
Tungsten, oxidized
Brick
Zinc
+10%
-10%
Measuring object
Wolfram under intert gas
0.7-0.9 0.65-0.85
0.8-0.92 0.8-0.9
0.02-0.05 0.02-0.05
0.35-0.45 0.4
0.65-0.75 0.6-0.7
0.10 0.05-0.1
0.3-0.7 0.2-0.8
n.s. 0.15-0.2
n.s. 0.3-0.5
0.5-0.7 0.5-0.7
0.6-0.8 0.6-0.7
0.7-0.9 0.7-0.85
0.22 0.15-0.2
0.6 0.6
0.8-0.9 0.8-0.9
0.4 0.35
0.95 0.95
0.45-0.6 0.45-0.6
0.85 0.8-0.85
n.s. n.s.
0.1-0.2 0.05-0.2
0.4-0.55 0.3-0.45
0.8-0.9 0.7-0.9
0.8-0.9 0.8-0.9
0.86-0.9 0.8-0.9
0.4-0.9 0.4-0.9
0.35-0.45 0.3-0.4
0.55-0.85 0.55-0.85
0.3-0.45 0.3-0.4
0.7-0.9 0.7-0.85
0.85-0.9 0.8-0.9
0.45-0.58 0.45-0.55
-6.5°C -10.5°C
+7°C +11.5°C
0.6-0.8 0.5-0.75
0.8-0.9 n.s.
0.02 0.02
0.35 0.3
0.5 0.5
0.05 n.s.
0.2-0.7 n.s.
0.15-0.2 0.1-0.4
0.3-0.55 0.2-0.6
0.4-0.7 0.35-0.6
0.5-0.6 0.5-0.6
0.65-0.8 0.6-0.7
0.15-0.2 n.s.
0.6 n.s.
0.8-0.9 n.s.
0.35 0.3
0.95 n.s.
n.s. n.s.
n.s. n.s.
0.01 0.01
0.05-0.2 0.05-0.25
0.3-0.4 0.25-0.4
0.7-0.9 0.75-0.85
0.8-0.9 0.75-0.85
k.A. n.s.
0.4-0.9 n.s.
0.3-0.4 n.s.
0.5-0.7 n.s.
0.15-0.25 n.s.
0.65-0.85 0.5-0.7
n.s. n.s.
0.35-0.55 n.s.
-12°C
+13°C
Emissivity M313
0.35