Siemens sitrans LR 400 Instruction Manual page 46

4.2.3.1: Sensor Damping (F = 10 s)
Averaging of measuring signal. Not displayed if a user vessel is selected in Parameter
4.2.2.1.
Value
This parameter is not displayed when a user vessel is selected in Parameter 4.2.2.1. 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.
Enter the damping in seconds.
Note:
Specification of a 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 or volume described in Function 4.2.4.4.
4.2.3.2: Multiple Echo (F = on)
Evaluate multiple echo
Value
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
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.
Page 42
numerical
on
off
on
off
SITRANS LR 400 – INSTRUCTION MANUAL 7ML19985FH03