LumaSense Technologies InfraWin 5 - Manual (Page 17)

InfraWin 5 Manual Working with the Devices/ Parameters Window 17
If the signal is too low for a correct measurement, the pyrometer interrupts the measurement and
displays 1 °C below of beginning of the temperature range. Although the factory default is set to
10%, the switch-off limit can be adjusted between 2 and 50%, depending on the application.
However, it is important to note that the smaller the value, the higher the chance that daylight or
reflections will affect a correct measurement.
3.2.9 Response Time t
90
The response time t
90
is the time interval for the analog output of the pyrometer to go from a low
temperature value up to 90% of the temperature step to a high value when measuring an abrupt
increase from said low to said high temperature.
When set to min, the device operates using its time constant. The dynamic exposure time
adjustment prolongs the exposure time at the lower range limit, also its t
90
is set to a lower value.
However, a higher response time will need to be chosen if the maximum value storage is selected,
the measuring object has a low emissivity, and the measuring temperature is at the beginning of
the range. Longer response times can also be used to achieve constant temperature readings for the
measurement of objects which have rapidly fluctuating temperatures.
For more information on this setting, refer to the documentation that came with your pyrometer.
3.2.10 Clear time of the maximum / minimum value storage (t
CL
)
If the maximum value storage is switched on, the highest last temperature value will always be
displayed and stored. The minimum value storage saves the lowest measurements taken during a
reading. As such, it may be beneficial to periodically clear and reset the stored values in order to
obtain new temperature readings.
This feature is particularly useful when fluctuating object temperatures cause the display or the
analog outputs to change too rapidly, or the pyrometer is not constantly viewing an object to be
measured. In addition, it may also be beneficial to periodically delete and reset the stored maximum
values.
Single and Double Storage Modes
Depending upon the selected settings, the maximum value storage will either work in single
storage mode or in double storage mode.
Single Storage Mode
Single storage mode is used when you want to reset the stored value
using an external impulse via one contact closure from an external
relay (such as between two measured objects). This mode allows a
new value to be established after each impulse from the reset signal.
Single storage mode also comes into effect when the Clear Peak
Memory t
clear
is set to AUTO.
Double Storage Mode Double storage mode comes into effect when selecting one of the
reset intervals via push buttons or PC interface. This mode utilizes
two memories. With the first memory, the highest measured value is
held and is deleted alternately in the time interval set (clear time).
The other memory retains the maximum value throughout the next
time interval. The disadvantages of fluctuations in the display with
the clock frequency are thereby eliminated.