VEGA VEGAPULS 67 (≥ 2.0.0 - ≤ 3.8) Foundation Fieldbus - Manual (Page 40)

Information:
However, the measuring signals are not damped by the product in
completely empty, closed metal vessels. Due to this, considerable
multiple reflections can be caused by which the noise level can
increase. In such vessels, it is recommended to carry out the gating
out of false echoes with a partial filling.
Gating out of false signals
Change now?
Proceed as follows:
1 Move from the measured value display to the main menu by
pushing [OK].
2 Select the menu item "Service" with [->] and confirm with [OK].
Now the menu item "False signal suppression" is displayed.
3 Confirm "False signal suppression - Change now" with [OK] and
select in the below menu "Create new". Enter the actual distance
from the sensor to the product surface. All false signals in this area
are detected by the sensor and saved after confirming with [OK].
Note:
Check the distance to the product surface, because if an incorrect (too
large) value is entered, the existing level will be saved as false signal.
The filling level would then no longer be detectable in this area.
The menu item "Extended setting" offers the possibility to optimise
VEGAPULS
67 for applications in which the level changes very
quickly. For this reason, select the function "Quick level change > 1 m/
min.".
Extended setting
quick level change > 1 m/min.
Note:
Since with the function "Quick level change > 1 m/min." the generation
of an average value of the signal processing is considerably reduced,
false reflections by agitators or vessel installations can cause
measured value fluctuations. A false echo memory is thus recom-
mended.
Extended setting/Quick
level change
40 VEGAPULS 67 • Foundation Fieldbus
6 Set up with the indicating and adjustment module PLICSCOM
32941
-EN
-100514