METIS M311 / M322 / H311 / H322 (17-pin)
Pyrometer Parameters / Settings
21
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 laborato-
ry and confirmed in application-
oriented measurements. They can
vary due to material-dependent condi-
tions, 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 correct emis-
sivity also a comparison measure-
ment can be performed with a ther-
mocouple).
“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.
Magnesium, oxidized
n.s.
0.3-0.5
Brass, shiny
0.5-0.7
0.5-0.7
Brass, oxidized
0.6-0.8
0.6-0.7
Molybdenum, oxidized
0.7-0.9
0.7-0.85
Nickel
0.22
0.15-0.2
Porcelain, glazed
0.6
0.6
Porcelain, rough
0.8-0.9
0.8-0.9
Platinum
0.4
0.35
Soot
0.95
0.95
Chamotte
0.45-0.6
0.45-0.6
Slag
0.85
0.8-0.85
Silver, shiny
n.s.
n.s.
Silver, oxidized
0.1-0.2
0.05-0.2
Steel, shiny
0.4-0.55
0.3-0.45
Steel, oxidized
0.8-0.9
0.7-0.9
Steel, rolled
0.8-0.9
0.8-0.9
Stoneware, glazed
0.86-0.9
0.8-0.9
Stainless steel
0.4-0.9
0.4-0.9
Titanium, shiny
0.35-0.45
0.3-0.4
Titanium, oxidized
0.55-0.85
0.55-0.85
Tungsten, shiny
0.3-0.4
0.3-0.4
Tungsten, oxidized
0.7-0.9
0.7-0.85
Brick
0.85-0.9
0.8-0.9
Zinc
0.45-0.58
0.45-0.55
Measurement deviations at a 10% false set emissivity
at a temperature of 700°C:
+10%
-6.5°C
-10.5°C
-10%
+7°C
+11.5°C
6.3
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.
6.4
Spot Size Fill Factor
Entering a fill factor that indicates how much percent of the measuring field is filled, has no influence if
using the 2-color measuring mode (see also
Alignment to the Measuring Object
).
In 1-color mode:
Measurements of objects that are smaller than the pyrometer’s spot size can be per-
formed when measuring hot objects in front of a cold background. In this case the fill factor specifies
how much percent the measuring field is filled.
INFO:
Emissivity, transmittance and spot size fill factor are directly related to each other, the re-
sult of the multiplication of the 3 parameters has to be minimum 5%.
6.5
Switch-off Level
2-color pyrometers measure even with reduced signal strength, such as those occur in a partially filled
measuring field, or dust, smoke, steam, or a window in the beam path between pyrometer and the
measuring object. If the signal strength is too low for a reliable measurement, the measurement is
switched off to avoid measurement errors. In this case the current output can be set to 0 or 4 mA or
20 mA, and also serial interface settings can be defined.