Siemens sitrans LR 400 Instruction Manual page 42

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).
Value
Enter 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.
Specification of damping directly influences the evaluation of the measuring
Note:
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).
4.2.3.2: Multiple Echo (F = on)
Evaluate multiple echoes. The multiple echo evaluation suppresses multiple
reflections by assigning them a lower probability than the measuring signal.
Value
4.2.3.3: Echo Motion (F = off)
Evaluate echo motion
Value
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.
4.2.3.4: Window Tracking (F = Off)
Value
A window follows the measured value which it is forced to track. The window size is
calculated from the set filling speed. Switch off window tracking for applications where
SITRANS LR 400 is unable to keep up to level changes. By using SIMATIC PDM, you can
display a list of all echoes in your vessel. It provides the distance between the flange and
7ML19985JC02
numerical
On
Off
On
Off
On
Off
SITRANS LR 400 (Solids) – INSTRUCTION MANUAL Page 39