Endress+Hauser Prosonic S FMU90 - 6.4 Basic setup

Prosonic S FMU90 Flow Measurement PROFIBUS Commissioning
Endress+Hauser 55
5.7.4 Interference echo suppression: Basic principles
Parameter Remarks
"check value"
"distance mapping"
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
A The envelope curve (a) contains the level echo and an interference echo. Without interference echo suppression, the
interference echo is evaluated.
B The interference echo suppression generates the mapping curve (b). This curve suppresses all echoes within the range
of mapping (c).
C From now on, only those echoes are evaluated, which are higher than the mapping curve. The interference echo is
below the mapping curve and is therefore ignored.
In order to include all interference echoes, the interference echo suppression should be
performed with the level as low as possible (ideal: vessel empty). 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%)
A
B
(a) (a)
(b)
(c)
C
(a)
(b)