Siemens SITRANS LR560 Operating Instructions Manual page 78

2.4.5.3.
Sets the minimum echo confidence that the echo must meet in order to
prevent a Loss of Echo condition and the expiration of the LOE timer. When
Confidence (2.4.7.1.) exceeds Echo Threshold (2.4.5.3.), the echo is
accepted as a valid echo and is evaluated.
Values
Related Parameters
Use this feature when an incorrect material level is reported.
2.4.5.4.
Notes:
• CLEF Range is referenced from Far Range.
• The value for CLEF Range must include the difference between Far
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 algorithm is used. For more
detail see CLEF Range (2.4.5.4.) on page 118 .
Values
Related parameters
CLEF Range
Page 72 SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS
Echo Threshold
CLEF Range
Range and Low Calibration Point, plus any level above the Low
Calibration Point to be managed by the CLEF algorithm.
Range: 0 to 45 m (40 m device)
Default: 0.0 m
Position Detect (2.4.5.2.)
Far Range (2.4.2.)
Range: 0 to 99
Default: 5
LOE Timer (2.3.3.)
0 to 105 m (100 m device)
Low Calibration
Point
sensor
reference
point
Far
Range
7ML19985LT01