52
6 Set up the sensor with the display and adjustment module
VEGAPULS 69 • Modbus and Levelmaster protocol
47252-EN-210205
The following circumstances cause interfering reflections and can
influence the measurement:
•
High mounting nozzles
•
Vessel internals such as struts
•
Agitators
•
Buildup or welded joints on vessel walls
Note:
A false signal suppression detects, marks and saves these false
signals to ensure that they are ignored in the level measurement.
This should be done with the lowest possible level so that all potential
interfering reflections can be detected.
Proceed as follows:
1. Select with
[->]
the menu item "
False signal suppression
" and
confirm with
[OK]
.
2. Confirm 3-times with
[OK]
and enter the actual distance from the
sensor to the product surface.
3. All interfering signals in this range are detected by the sensor and
stored after being confirmed 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.
If a false signal suppression has already been saved in the sensor,
the following menu window appears when selecting "
False signal
suppression
":
Delete
: An already created false signal suppression will be com-
pletely deleted. This is useful if the saved false signal suppression no
longer matches the metrological conditions in the vessel.
Extend
: is used to extend an already created false signal suppres-
sion. This is useful if a false signal suppression was carried out with
Additional settings - False
signal suppression
