Vega VEGASON 61 Operating Instructions Manual page 33

Service - False signal
suppression
VEGASON 61 • Four-wire 4 ... 20 mA/HART
6 Set up with the display and adjustment module PLICSCOM
The following functions are available with " Echo and false echo
curve":
•
"X-Zoom": Zoom function for the meas. distance
•
"Y-Zoom": 1, 2, 5 and 10x signal magnification in " dB"
•
"Unzoom": Reset the presentation to the nominal measuring range
without magnification
In the menu item " Trend curve" the following are available:
•
"X-Zoom": Resolution
– 1 minute
– 1 hour
– 1 day
•
"Stop/Start": Interrupt a recording or start a new recording
•
"Unzoom": Reset the resolution to minutes
As default setting, the recording pattern has 1 minute. With the adjust-
ment software PACTware, this pattern can be also set to 1 hour or 1
day.
Echo curve
High nozzles 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 reflec-
tions will be detected.
False signal suppression
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 medium surface. All false signals in this
area are detected by the sensor and saved after confirming with
[OK].
Note:
Check the distance to the medium surface, because if an incorrect
(too large) value is entered, the existing level will be saved as a false
signal. The level would then no longer be detectable in this area.
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