Siemens SITRANS LR560 Operating Instructions Manual page 124

Purpose:
Description:
Related parameters:
CLEF RANGE (2.7.3.4)
Note
CLEF range
• CLEF Range is referenced from Far Range.
• The value for CLEF Range must include the difference between Far Range and Low
Calibration Point, plus any level above the Low Calibration Point to be managed by the
CLEF algorithm.
Factory setting:
Setting range:
Purpose:
Related parameters:
①
③
SITRANS LR560 (mA/HART)
Operating Instructions, 06/2017, A5E34647946-AD
CLEF (Constrained Leading Edge Fit)
Defines where on the echo the distance measurement is determined.
If the vessel bottom is being reported as the level instead of the actual
material level (at low conditions), we recommend setting Position to Hybrid
and using it in combination with CLEF Range.
CLEF RANGE (2.7.3.4) (Page 123)
0.00 m
40 m device: 0 to 45 m
100 m device: 1 to 105 m
The CLEF algorithm is used mainly to allow correct level reporting for low
dK materials which may otherwise cause an incorrect reading in an empty
or almost empty vessel. It is used from Far Range up to the level defined
by CLEF Range (see illustration below). Above that point, the Center algo-
rithm is used.
POSITION DETECT (2.7.3.3) (Page 122)
FAR RANGE (2.7.2.) (Page 121)
CLEF Range
Sensor reference point
②
Low calibration point
④
Far range
Parameter Reference
8.2 SETUP (2.)
123