IN 5/9 plus Manual
Parameter Descriptions / Settings
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5
Parameter Descriptions / Settings
5.1
Settings at the pyrometer or via serial interface
5.1.1
Emissivity (Emi)
For a correct measurement, it is necessary to adjust the emissivity. The
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 20 and 100%, respectively 120% in
Online Mode, the set value is indicated on the display). Additionally, the emissivity is 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.
For the spectral range of the IN 5/9 plus, the typical emissivity on Sapphire and Sapphire Wafers
lies between 98 and 99 %.
Note:
The minimum emissivity setting for the pyrometer is 20%!
Setting examples at the
instrument:
Emi =
100%:
Emi =
85%:
If the settings directly at the pyrometer should be used the pyrometer must be switched into
offline mode (OFFL, see
4.2
). To adjust the emissivity via software, see InfraWin description in
the program’s help menu. Click on the F1 button after loading InfraWin or click on the ? in the
menu bar.
Note:
If the emissivity is set to an incorrect value (below 20%), the instrument will
automatically utilize an emissivity value of 100%. The setting 00 is interpreted as
Emi = 100%.
5.1.2
Exposure time (t
90
)
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 of
< 180 ms. Longer exposure times can be used for
the measurement of objects which have rapidly
fluctuating temperatures to achieve constant
temperature reading.
Settings:
100%
(in Online Mode,
up to 120%)
.
.
.
20%
Example: t
90
= 1 s Example: t
90
= 5 s
0.5 s
1 s
2 s
5 s
4/0mA
ONL/OFFL
Emi
x10 x1
O
N DI
P
1
2
3
4
5
6
0.5 s
1 s
2 s
5 s
4/0mA
ONL/OFFL
Emi
x10 x1
O
N DI
P
1
2
3
4
5
6
Setting examples at the instrument:
