A.2.4 Echo Threshold - Siemens SITRANS LR250 Operating Instructions Manual
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Appendix A: Technical reference
A.2 Echo processing
A.2.4
Echo Threshold
Confidence (2.5.9.1.) describes the quality of an echo. Higher values represent higher quality.
Echo Threshold defines the minimum confidence value required for an echo to be accepted as
valid and evaluated.
A.2.5
Echo Lock
If the echo selected by Algorithm is within the Echo Lock window, the window is centered about
the echo, which is used to derive the measurement. In radar applications, two measurement
verification options are used:
Lock Off
SITRANS LR250 responds immediately to a new selected echo (within the restrictions set by the
Maximum Fill / Empty Rate), but measurement reliability is affected.
Material Agitator
A new measurement outside the Echo Lock Window must meet the sampling criteria before the
window will move to include it.
The other available options, Maximum Verification and Total Lock are not recommended for
radar.
A.2.6
Auto False Echo Suppression
Note
• For detailed instructions on using this feature via PDM see Auto False Echo Suppression
(Page 87).
• For detailed instructions on using this feature via the handheld programmer see Auto
False Echo Suppression (2.5.10.1.).
Auto False Echo Suppression is designed to learn a specific environment (for example, a
particular vessel with known obstructions), and in conjunction with Auto False Echo Suppression
Range to remove false echoes appearing in front of the material echo.
The material level should be below all known obstructions at the moment when Auto False Echo
Suppression learns the echo profile. Ideally the vessel should be empty or almost empty, and if
an agitator is present, it should be running.
The device learns the echo profile over the whole measurement range and the TVT is shaped
around all echoes present at that moment.
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SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 08/2014, A5E32221386-AC
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