INFRATHERM
pyrometer IS 50-LO/GL
20
8 Instrument
settings
8.1
Controls and interface connection
The controls for emissivity, a switch for a test
current and a connector for the service
interface (to adjust a temperature sub range,
see
8.5 Settings via service interface / PC
)
are located in the converter housing.
This controls can be accessed by removing
the converter’s cover. To remove the rear
cover unscrew the four screws and take the
cover off.
Emissivity
setting
Test current
switch
Service
interface
Note:
Only operate the device for a prolonged period of time when it is closed! After setting
the parameters, replace the housing cover immediately to prevent dirt from entering
the device!
8.2 Factory
settings
Emissivity
ε
: 100%
Test current output:
Off
Temperature range:
600 ... 1800 °C (or when ordering from customer required temperature range)
8.3 Emissivity
For a correct measurement it is necessary to adjust the emissivity. This emissivity is the relation-
ship between the emission of an 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% (set-
tings at the pyrometer between 5 and 100%). Additionally the emissivity is depending 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 are listed below.
Measuring object
Emissivity
ε
(at 0.8 ... 1.1 µm)
molten glass
96%
Set up examples at the instrument:
ε
=100%:
ε
=
85%:
Note:
If the emissivity is set to a value below 5% the instrument will automatically utilize an
emissivity value of 5%. The setting 00 is interpreted as
ε
= 100%.
8.4
Test current switch
The test button activates a test current of 12 mA on the analog output (corresponds to the middle of the 4 ... 20 mA
analog output). This enables to test external indicators for correct scaling. The readings of the internal indicator should
correspond to the reading of the external indicator (e.g. 1200°C at a temperature range of 600...1800°C). If both displays
show different readings the external indicator has a wrong temperature range or input current.
8.5
Settings via service interface / PC
Via the service interface and a RS232 adapter cable the pyrometer can be connected to a PC (compatible cable and
software see
11.2 Reference numbers accessories
). The service software “
IS 50 – Service
” (compatible with Windows
95 or later) enables to select a sub-measurement range (minimum 51°C) within the full measurement range (600°C to
1800°C) to set the analog output (4 - 20 mA) to this range. The 4 mA output corresponds to the beginning of the tem-
perature range, the 20 mA output to the end of the temperature range. The full measurement range is automatically
relayed to the output signal without restricting the sub-measurement range.
Additionally to the temperature range settings some instrument data are displayed.
Settings:
100%
. . .
5%
