VEGA VEGAPULS 66 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART four-wire - Manual (Page 33)

H
igh sockets or vessel installations, such as e. g. struts or agitators as
well as buildup and weld joints on the vessel walls cause interfering
reflections which can impair the measurement. A false echo storage
detects and marks these false echoes, so that they are no longer taken
into account for the level measurement. A false echo memory should
be created with low level so that all potential interfering reflections will
be detected.
G ating out of false signals
C hange now?
P
roceed as follows:
1 M ove from the measured value display to the main menu by
pushing [OK].
2 S elect the menu item "Service" with [->] and confirm with [OK].
N ow the menu item "False signal suppression" is displayed.
3 C onfirm "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:
C
heck the distance to the product surface, because if an incorrect (too
large) value is entered, the existing level will be saved as false signal.
T
he filling level would then no longer be detectable in this area.
T he menu item "Extended setting" offers the possibility to optimise
VEGAPULS 66 for applications in which the level changes very
quickly. For this reason, select the function "Quick level change > 1 m/
min.".
E xtended setting
quick level change > 1 m/min.
Note:
S
ince 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.
T
his function enables reading out parameter adjustment data as well
as writing parameter adjustment data into the sensor via the indicating
and adjustment module. A description of the function is available in the
operating instructions manual "Indicating and adjustment module".
Gating out of false sig-
nals
Extended setting/Quick
level change
Copy sensor data
VEGAPULS 66 • 4 … 20 mA/HART four-wire 33
6 S et up with the indicating and adjustment module PLICSCOM
28443
-EN
-090305