LumaSense Technologies ISR 12-LO - Handbuch (Seite 22)

IMPAC pyrometers ISR 12-LO · IGAR 12-LO
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Additionally to the bar graph of the relative signal the warning level and the switch-off level are indicated as
vertical lines in colors corresponding to the windows below.
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 signals, 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 temperature range. Depending of the application the switch-off limit can be ad-
justed between 2 and 50%, ex works at delivery set to 10%.
Warning level „dirty window“: the pyrometers are equipped with a contamination monitoring system. A correct
temperature measurement might be impossible if the 2-color 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 relays switches at the too low signal level and can be used to switch a warning signal (see
section 4, Electrical Installation). When this happens the built-in indicator of the pyrometer starts blinking
but continues the measurement.
The warning level can be set between 0 and 99%. 0% means the lens contamination monitoring system is
switched off (factory setting) and the relay has the function “external clearing” of maximum value storage
(see 9.3 Clear times of the maximum value storage (t
CL
)).
K: AutoFind: In addition, there is an input field K for the emissivity slope in the window. If the emissivity is
changed, the temperature change connected with this can be read off directly.
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 ex-
ample 1) (here: 824°C).
• If you press „K: Autofind “ a window will open which allows you
to enter the "true" temperature.
• Once the temperature entry has been entered and confirmed
with "OK", InfraWin will then calculate the emissivity slope which occurs with the
new temperature. This is displayed immediately and can be used for further tem-
perature measurement.
10.9
Measurement (online trend)
This window displays:
• temperature as graphical diagram
• current temperature
• measuring
mode
• quantity of the measured values
and file size of the current
measurement
The example shows a sample reading over
the period of approx. 12 seconds with a tem-
perature range between 300 and 1000°C. The
final temperature (at the end of the reading) is
573.3°C.
Also the targeting light (
)
can be switched on or off
at this point.
• With “Mark zone” a temperature range can color marked for easier recognition.
• Setting a temperature under “Threshold“ prevents the recording of values above or below this tempera-
ture to keep the file size small.
• With “Scaling trend“ the view of the temperature range can be limited.