LumaSense Technologies InfraWin 5 - Manual (Page 16)

InfraWin 5 Manual Working with the Devices/ Parameters Window 16
If you are operating the device in ratio (two-color) mode, you will have the ability to add a value for
the Emissivity Slope (K = 1 / 2).
3.2.5 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.
When you click the Emi: AutoFind button, a measured temperature is displayed along with the
current set emissivity. In the example below, the set emissivity is 57% and the measured
Temperature is 239.4°C.
Figure 7: EmiAutoFind Window
With Emi: Autofind, you can enter a Real temperature (true temperature) value and confirm
your entry by pressing the Calculate button. InfraWin will then calculate the new emissivity
associated with this temperature value. This new emissivity is displayed immediately and can be
used for further temperature measurement. If you operate a 2-color device in ratio mode, the same
feature is available as "K AutoFind" to evaluate the correct emissivity slope K = 1 / 2.
Note: AutoFind only works if the measured radiation temperature is sufficiently different
from the detector temperature. If these temperatures are too close together, the AutoFind
Button is disabled.
3.2.6 Operating Modes
The Operating Modes feature allows you to choose whether or not you want to run the device in
1-Channel temperature mode, Ratio temperature mode, or Metal mode.
3.2.7 “Dirty Window” Warning (2-color pyrometers only)
Certain 2-color 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 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% by entering a value in the “Warning threshold”
and pressing the OK button. 0% means the “dirty window” warning system is switched off (factory
setting) and the relay can perform the function external clearing of maximum value storage or
external hold, when one of them is activated. Set the warning threshold well above the value of the
"Minimum Intensity Switch-Off level" or to 0%.
3.2.8 Minimum Intensity Switch-Off Level (2-color pyrometers only)
The minimum intensity switch-off level is a function that is used to avoid measurement errors
caused by signals which are too low. This may be caused by a dirty viewing window, dust that exists
in the field of view, or when the spot is not filled by the measuring object, for example.