Window Transmittance - KPM PROCESS SENSORS METIS M311 Operating Manual

temperature corrections due to higher
background reflection.
In principle applies: to measure metals
in a short-wavelength spectral range
as possible, as here the emissivity is
higher than in the long-wave range.
The specified values are guide values,
which were determined in the labora-
tory and confirmed in application-ori-
ented measurements. They can vary
due to material-dependent conditions,
as in metals additionally to the surface
texture alloy components play an im-
portant 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 correct emissiv-
ity also a comparison measurement
can be performed with a thermocou-
ple).
▪ "n.s." (not specified) means that no
values exist for this wavelength
range e.g. because a reasonable
measurement in this wavelength or
temperature range is not possible.
▪ The emissivities with "shiny" refer to
applications that are performed un-
der an inert gas or in a vacuum.
Measurement deviations at a 10% false set emissivity
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%.

6.2.6 Window Transmittance

If there is a sight glass between the measuring object and the pyrometer, there is a reduction in the signal, that
is compensated by using the ratio measurement technique. In the case of measurements in 1-color mode, this
signal weakening leads to a reduced temperature display, which can be compensated by entering the transmit-
tance of the sight glass.
Settings:
▪ 5%–100%
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%.
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METIS M311 / M322 / H311 / H322 (12-pin device connector)
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
Zink
at a temperature of 700°C:
0.10
0.3-0.7
n.s.
n.s.
0.5-0.7
0.6-0.8
0.7-0.9
0.22
0.6
0.8-0.9
0.4
0.95
0.45-0.6
0.85
n.s.
0.1-0.2
0.4-0.55
0.8-0.9
0.8-0.9
0.86-0.9
0.4-0.9
0.35-0.45
0.55-0.85
0.3-0.4
0.7-0.9
0.85-0.9
0.45-0.58
+10% 6.5°C
-10% 7°C
0.05-0.1
0.2-0.8
0.15-0.2
0.3-0.5
0.5-0.7
0.6-0.7
0.7-0.85
0.15-0.2
0.6
0.8-0.9
0.35
0.95
0.45-0.6
0.8-0.85
n.s.
0.05-0.2
0.3-0.45
0.7-0.9
0.8-0.9
0.8-0.9
0.4-0.9
0.3-0.4
0.55-0.85
0.3-0.4
0.7-0.85
0.8-0.9
0.45-0.55
10.5°C
11.5°C