LumaSense Technologies ISQ 5-LO - Handbuch (Seite 23)

IMPAC pyrometers ISQ 5 · ISQ 5-LO
23
9.9 Measurement color bar
This window displays:
 current temperature, graphically and numerically
 file size and quantity of the measured values of
the current measurement
 measuring mode (mono- , ratio- or metal mode)
 emissivity
 or emissivity slope K, depending of
the measuring mode
 the internal temperature of the converter (T
int
)
 minimum (T
min
) and maximum values (T
max
)
 strength of the relative signal
 Warning level, graphically and numerically
 Switch-off level, graphically and numerically
The measuring mode, the emissivity or
emissivity slope and values for the warn-
ing level and switch-off level can be set in
this window. The laser targeting light can
be switched on or off with the PL-button
( ).
The color bar display shows the span of the temperature
range or the adjusted sub-range. Entering temperature val-
ues in the white fields on the right and left side of the color
bar, limits for the color change of the color bar can be set.
These limits can also be changed by moving the small bar
with the PC mouse. The color bar displays temperatures
within the two limits in green color, outside the limits in red
color
The bar graph “relative signal” shows a signal weakening. This can be caused by contamination of the optics
or a viewing window or by dust in the field of view or a too small measuring object. Normally this bar graph is
used for surveillance of the level of contamination of optics or window. It shows the measured intensity com-
pared to the intensity, a black body radiation source would have at a determined ratio temperature of the
pyrometer. Precondition for this is the correct adjustment of the emissivity slope K (a wrong adjustment re-
sults in relative signals above 100%, in this case K has to be adjusted correctly). The display of the type
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 3, 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 8.1 Clear time settings (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 meas-
ured object using the "K: AutoFind“ function: