Endress+Hauser Prosonic S FMU90 - 4.6 Connection of a temperature sensor

The "level" menu
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2.1.7 Interference echo suppression: Basic principles
The "check value" and "distance mapping" parameters are used to configure the interference
echo suppression of the Prosonic S.
The following picture shows the operating principle of the interference echo suppression:
L00-FMU90xxx-19-00-00-yy-017
1: The envelope curve (a) contains the level echo and an interference echo. Without interference echo suppression, the
interference echo is evaluated.
2: The interference echo suppression generates the mapping curve (b). This curve suppresses all echos within the range
of mapping (c).
3: From now on, only those echos are evaluated, which are higher than the mapping curve. The interference echo is below
the mapping curve and is therefore ignored.
!
Note!
In order to include all interference echos, the interference echo suppression should be performed
with the level as low as possible. If during commissioning the vessel can not be sufficiently emptied,
it is advisable to repeat the interference echo suppression at a later point of time (as soon as the level
reaches nearly 0%).
1
2
(a) (a)
(b)
(c)
3
(a)
(b)