LumaSense Technologies ISR 320 - Manual (Page 28)

ISR 320 Manual Software InfraWin 28
5.6 Warning Level / Switch-Off Level
In addition to the relative signal bar graph, the warning level and the switch-off level are
indicated as vertical lines in colors corresponding to the windows below.
The ISR 320 pyrometers are equipped with a warning level “dirty window” monitoring
system. A correct temperature measurement might be impossible if the ratio pyrometer is
working at a too low signal level. To avoid these wrong measurements in advance, a warning
signal can be set to a certain contamination level. A built-in relay switch can be used to switch to
a warning signal when the signal becomes too low. When this happens, the built-in indicator of
the pyrometer starts blinking, but will continue the measurement.
The warning level can be set between 0 and 99%. 0% means the “dirty window” warning
system is switched off (factory setting). If signal intensity is lower than the set “dirty window”
warning threshold, the green LED at the backside of the instrument will be flashing.
The switch-off level is a function used to avoid measuring errors caused by too low signals.
Ratio pyrometers are able to measure temperatures correctly even with very low signals. 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 the beginning of the temperature range. Although the factory default is
set at 10%, the switch-off limit can be adjusted between 2% and 50%, depending on the
application.
5.7 Emissivity Slope K: AutoFind
InfraWin also offers an input field K for the emissivity slope. If the emissivity is changed, the
temperature change connected with this can be directly affected.
If the true temperature of the measured object is known, you can calculate the emissivity slope
of the measured object using the K: AutoFind function:
A measured temperature is displayed
with the current set emissivity slope. In
this example, the emissivity slope is set
at 1.000 and the resulting temperature
reading is 845.2 °C.
If you press the K: Autofind button, a
window will open which allows you to
enter the true temperature.
In this example, we have entered a
temperature of 870 °C.
Once you enter the temperature value,
you can press the OK button to set the
temperature value and close the
temperature window.