LumaSense 320 Series User Manual

IGA 320/23 Operating Manual Settings / parameter descriptions
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4.5 Emissivity ε
For a correct measurement, it is necessary to adjust the emissivity. This emissivity is the
relationship between the emission of a real object and the emission of a blackbody radiation
source (this is an object, which absorbs all incoming rays and has an emissivity of 100%) at the
same temperature. Different materials have different emissivities ranging between 0% and
100% (settings at the pyrometer between: 10 and 100%). As such, the emissivity is also
dependent on the surface condition 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
instrument 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
Emissivity [%]
(at 2.3 µm)
Measuring object
Emissivity [%]
(at 2.3 µm)
“Black body furnace“
100
Steel, molten
20 to 30
Extruded Aluminum
13
Nickel
15 to 20
Brass
18
Titanium, non-oxidized
50
Brass oxidized (tarnished)
65 to 70
Titanium, oxidized
75 to 80
Copper
5
Molybdenum
10
Copper, oxidized
70 to 80
Molybdenum, oxidized
75 to 80
Inconel
30
Black Carbon
95
Inconel, oxidized
85
Graphite
80 to 90
Oxidized Iron
85 to 90
Stoneware, glazed
60
Steel rolling scale
80 to 88
Porcelain rough
80 to 90
4.6 Transmittance
τ
Using the close-up lens or measurements through windows slightly attenuates the measuring
signal (due to the transmittance). To get correct measuring results, the transmission of the close-
up lens / window (90% for the close-up lens of the IGA 320/23) must be compensated.
Alternatively, the emissivity ε can be adapted. For the close-up lens: ε
Trans
= 0.90 x ε
Object
4.7 EmiAutoFind
If the true temperature of the measured object is known, you can calculate the emissivity of the
measured object using the Emi: AutoFind function.
4.8 Response time / exposure time (t90)
The exposure time is the time interval when the measured temperature has
to be present after an abrupt change so that the output value of the
pyrometer reaches a given measurement value. The time taken is to reach
90% of the recorded temperature difference. In the “min” position, the
device operates using its time constant.
The dynamic exposure time adjustment prolongs the exposure time at the
lower range limit, also its t
90
is set to a lower value.
If the maximum value storage is selected and the measuring object has a low emissivity and the
measuring temperature is at the beginning of the range, a higher exposure time must be chosen
to prevent measurement errors. Longer exposure times can be used for the measurement of
objects, which have rapidly fluctuating temperatures to achieve constant temperature reading.
Settings:
min
0.01 s
0.05 s
.
.
.
10.00 s

LumaSense 320 Series Specifications

General

Brand	LumaSense
Model	320 Series
Category	Measuring Instruments
Language	English