Transmittance; Spot Size Fill Factor - Sensor Therm METIS M3F1 User Manual

METIS M3F1
Configuring the Pyrometer / Pyrometer Parameters
The specified values are guide values, which were determined in the laboratory and confirmed in appli-
cation-oriented measurements. They can vary due to material-dependent conditions, as in metals addi-
tionally 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 surface from smooth to rough, rough
surfaces have higher emissivities (for determining the correct emissivity also a comparison meas-
urement can be performed with a thermocouple).
 "n.s." means that no values exist for this wavelength range (not specified), 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 under an inert gas or in a vacu-
um.
Measuring object
Calibration source
Aluminum, shiny
Aluminum, oxidized
Aluminum, sandblasted, rough
Aluminum, black anodized
Lead oxidized
Bronze
Iron, liquid
Iron, shiny
Iron, oxidized
Graphite
Gold, shiny
Inconel, shiny
Inconel, oxidized
Copper, shiny
Copper, oxidized
Magnesium, shiny
Magnesium, oxidized
Brass, shiny
Brass, oxidized
Molybdenum, oxidized
Measurement deviations at a 10% false set emissivity
6.4

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.
6.5

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
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 mul-
tiplication of the 3 parameters can be max. 5%.
Emissivity [%] Measuring object
0.7-1.1 µm
1 Nickel
n.s. Porcelain, glazed
n.s. Porcelain, rough
n.s. Platinum
n.s. Soot
n.s. Chamotte
0.2-0.4 Slag
0.15-0.3 Silver, shiny
0.3-0.4 Silver, oxidized
0.7-0.9 Steel, shiny
0.8-0.92 Steel, oxidized
0.02-0.05 Steel, rolled
0.35-0.45 Stoneware, glazed
0.65-0.75 Stainless steel
0.10 Titanium, shiny
0.3-0.7 Titanium, oxidized
n.s. Tungsten, shiny
n.s. Tungsten, oxidized
0.5-0.7 Brick
0.6-0.8 Zinc
0.7-0.9
at a temperature of 700°C:
5.3 Measuring technology).
Emissivity [%]
0.7-1.1 µm
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
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