LumaSense Technologies ISQ 5-LO - Handbuch (Seite 18)

IMPAC pyrometers ISQ 5 · ISQ 5-LO
18
8.4 Baud rate
The transmission rate of the serial interface in Baud (Bd) is dependent on the length of
the cable. A standard cable length with RS232 for 19200 Bd is 7 m, with RS485 2 km.
The baud rate is reduced by 50% if the transmission distance is doubled.
8.5
Analog output (0 / 4 mA)
The analog output has to be selected according to the signal input of the connected
instrument (controller, PLC, etc.). If 4 - 20 mA is set the analog output gives 3.9 mA for
temperatures below lower range limit.
8.6
Setting of subrange
You have the opportunity to choose a subrange (minimum 51°C) within the basic measuring range of the
pyrometer. This subrange corresponds to the analog output.
Additionally with the setting of a subrange it is possible to fulfill the requirements of the “auto” clear mode of
the maximum value storage (see 8.1).
8.7
Switch-off level
The switch-off level is a function to avoid measuring errors caused by too low signals.
Ratio pyrometers are able to measure temperatures correctly even with very low sig-
nals, i.e. for example through a dirty viewing window or if dust exists in the field of view
or if the spot is not filled by the measuring object. If the signal is too low for a correct
measurement, the pyrometer interrupts the measurement and displays 1° below of beginning of the tempera-
ture range. Depending of the application the switch-off limit can be adjusted between 2 and 50%, ex works at
delivery set to 10%.
Note: The smaller the value the higher the chance that daylight or reflections affect a correct measurement.
8.8
One-channel mode / emissivity  settings
Via interface the device can be set to the one-channel mode. Then the emissivity corrected one-channel
temperature is send to the analog output. This simplifies the device adjustment. The one-channel mode is
indicated by a red LED at the rear cover.
For a correct measurement in the one channel mode it is necessary to adjust the emis-
sivity. This emissivity is the relationship between the emission of an real object and the
emission of a black body 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 via interface between
10 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 of various common materials for the two spectral ranges of
the instruments are listed below. The tolerance of the emissivity values for each material is mainly dependent
on the surface conditions. Rough surfaces have higher emissivities.
9 Settings via interface and software
The operating and analyzing software InfraWin is included in delivery of the pyrometer. With this software all
pyrometer functions also can be used on the PC.
This section gives an overview about the functions of the software. Additionally there is a description of the
individual icons in the program’s help menu. Click on the F1 button after InfraWin has been loaded or click on
the ? in the menu bar.
The following descriptions refer to program version 4.0. The latest version is available for free as download
from the homepage www.lumasenseinc.com.
Settings:
1.2 kBd
. . .
38.4 kBd
Settings:
0 - 20 mA
4 - 20 mA
Settings:
2%
. . .
50%
 settings:
10%
. . .
100%