Clef Range; Echo Threshold; Echo Lock - Siemens SITRANS L Operating Instructions Manual

C.3.2.1

CLEF range

CLEF Range (2.5.7.4.) is referenced from Low Calibration Point (process empty level ). When
the Hybrid algorithm is selected in Position Detect (2.5.7.2.), the CLEF algorithm will be
applied up to the limit of CLEF Range. Above this limit the Center algorithm will be applied.
①
②
③
C.3.2.2

Echo Threshold

Confidence (2.5.9.1.) describes the quality of an echo. Higher values represent higher
quality. Echo Threshold (2.5.7.3.) defines the minimum confidence value required for an
echo to be accepted as valid and evaluated.
C.3.2.3

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 with Echo Lock:
Lock Off
SITRANS LR200 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.
SITRANS LR200 with PROFIBUS PA
Operating Instructions, 07/2021, A5E32337680-AF
Center algorithm applied
High calibration point (process full
level)
Sensor reference point
④ Low calibration point (process empty level)
⑤ CLEF range
Technical reference
C.3 Echo processing
181