VEGA VEGAPULS 67 (≥ 2.0.0 - ≤ 3.8) 4 … 20 mA_HART four-wire - Manual (Page 34)

Information:
H
owever, 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.
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 67 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.
Extended setting/Quick
level change
34 VEGAPULS 67 • 4 … 20 mA/HART four-wire
6 S et up with the indicating and adjustment module PLICSCOM
32939
-EN
-100514