LumaSense Technologies IN 6/78-L - Manual (Page 18)

IN 6/78-L Operating Manual Settings / parameter descriptions · 18
One way to determine an accurate emissivity value for a material is to make a comparison
measurement as follows: If possible, coat a portion of the object with dull black paint or carbon
soot. Paint and carbon soot have high emissivity (95%) and take on the same temperature as the
object. Measure the temperature of the painted area with the emissivity control set to 95%.
Then measure the temperature of an adjacent unpainted area of the object and adjust the
emissivity until the pyrometer displays the same temperature.
4.3 Transmittance t
Measurements through windows slightly attenuates the measuring signal (due to the
transmittance). To obtain correct measuring results, the transmission of the window must be
compensated. Alternatively, the emissivity ε can be adapted.
4.4 Analog output
The analog output has to be selected according to the signal input of the
connected instrument (controller, PLC, etc.).
4.5 Maximum / minimum value storage
If the maximum value storage is switched on, the last highest temperature
value will always be displayed and stored. The minimum value storage saves
the lowest measurement taken during a reading. The storage has to be
cleared at regular intervals and be replaced with a new and actual value.
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.
The following settings are possible:
Off:
The max. value storage is switched off and only momentary values are measured.
0.1...25 s: If any clear time between 0.1 s and 25 s is set (0.1 s, 0.25 s, 0.5 s, 1 s, 5 s, 25 s), the
maximum value is estimated and held in double storage mode. After the
entered time the storage will be deleted.
extern: The external clearing can be activated and used within your own software using
the clear command “lx” (see Chapter
7 , Data format UPP). In this case, the
storage operates only in single storage because only a single deletion mechanism
is used.
auto: The auto mode is used for discontinuous measuring tasks. For example, objects
are transported on a conveyer belt and pass the measuring beam of the
pyrometer for only a few seconds. In this case, the maximum value for each object
has to be indicated. In this mode the maximum value is stored until a new hot
object appears in the measuring beam. The temperature which has to be
recognized as hot is defined by the low limit of the adjusted sub range. The
stored maximum value will be deleted when the temperature of the new hot
object exceeds the low limit from of the sub range by 1% or at least 2 °C. If a
lower limit is not entered, the maximum value storage will be deleted whenever
the lower level of the full measuring range has been exceeded.
Operation
note:
Depending upon which setting is selected, the maximum value storage will either
work in single storage mode or in double storage mode:
Settings:
0 ... 20 mA
4 ... 20 mA
Settings:
off
0.1 s
0.25 s
0.5 s
1 s
5 s
25 s
extern
auto