Siemens SITRANS LG260 Operating Instructions Manual page 31

Setup - False signal sup-
pression
PBD-51041059
The default setting is min. current 3.8 mA and max. current 20.5 mA.
The following circumstances cause interfering reflections and can
influence the measurement:
•
High mounting sockets
•
Vessel internals such as struts
•
Deflectors, etc.
Note:
A false signal suppression is only recommended with liquid applica-
tions.
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:
Enter the actual distance from the sensor to the product surface.
All interfering signals in this section are detected by the sensor and
stored.
Keep in mind that with covered probe only false signals in the uncov-
ered area of the probe are detected.
Note:
Check the distance to the product 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 created in the sensor,
the following menu window appears when selecting "False signal
suppression":
The instrument carries out an automatic false signal suppression
as soon as the probe is uncovered. The false signal suppression is
always updated.
The menu item "Delete" is used to completely delete an already cre-
ated false signal suppression. This is useful if the saved false signal
suppression no longer matches the metrological conditions in the
vessel.
SITRANS LG260 - Operating Instructions
31