User's Manual

Page 45 SITRANS LR 400 – INSTRUCTION MANUAL 7ML19985FH04
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Parameters (HART)
4.2.3.1: Sensor Damping (F = 1 s)
Averaging of measuring signal. Not displayed if a user vessel is selected in Parameter
4.2.2.1 (Application Type).
Enter the damping in seconds.
This parameter is not displayed when a user vessel is selected in Parameter 4.2.2.1
(Application Type). The sensor damping influences the evaluation of the measuring
signal. If the level generally only changes slowly and continuously, a time constant set
here can improve the measuring accuracy and the validity in poorly reflecting measuring
media or those with a restless surface. The sensor damping must always be smaller than
the interval of the time of change of the level (e.g. 1 mm/10 s), because too high a value
would have a negative influence on the measuring result.
4.2.3.2: Multiple Echo (F = on)
Evaluate multiple echo
The multiple echo evaluation suppresses multiple reflections by assigning them a lower
probability than the measuring signal.
4.2.3.3: Echo Motion (F = off)
Evaluate echo motion
Dynamic processes in the vessel are included in the evaluation of the measuring targets.
The typical filling speed can be set in Parameter 4.2.2.5. If the measured value still does
not follow the level height, switching off echo motion may improve the result.
Value numerical
Note: Specification of damping directly influences the evaluation of the measuring
signal. If you only want to dampen the calculated outputs at the analog output, you
should set the damping of level, volume or mass described in Function 4.2.4.4 (MinLim
Level).
Value
On
Off
Value
On
Off