Clef Range (2.7.3.4.); Echo Threshold (2.7.3.2.); Echo Lock (2.7.4.1.) - Siemens SITRANS LR560 Operating Instructions Manual

Example: CLEF enabled
Vessel height: 1.5 m; CLEF range set to 0.5 m
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A.3.3

CLEF RANGE (2.7.3.4.)

Determines the level below which the CLEF algorithm will be used. Above this level, the Center
algorithm is used when Hybrid is selected in POSITION DETECT (2.7.3.3) (Page 122). CLEF
Range is referenced from FAR RANGE (2.7.2.) (Page 121).
A.3.4

ECHO THRESHOLD (2.7.3.2.)

CONFIDENCE (2.7.6.1) (Page 126) 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.3.5

ECHO LOCK (2.7.4.1.)

If the echo selected by ALGORITHM (2.7.3.1) (Page 122) 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 LR560 responds immediately to a new selected echo (within the restrictions set by the
Maximum Fill / Empty Rate), but measurement reliability is affected.
SITRANS LR560 (mA/HART)
Operating Instructions, 06/2017, A5E34647946-AD
default TVT
material echo selected
vessel bottom echo
echo marker
Technical reference
A.3 Echo processing
183