User's Manual

Page 72 SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS 7ML19985LT01
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Parameters
2.4.5.3. Echo Threshold
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.
Use this feature when an incorrect material level is reported.
2.4.5.4. CLEF Range
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
Range: 0 to 99
Default: 5
Related Parameters
LOE Timer (2.3.3.)
Notes:
• 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.
Values
Range: 0 to 45 m (40 m device)
0 to 105 m (100 m device)
Default: 0.0 m
Related parameters
Position Detect (2.4.5.2.)
Far Range (2.4.2.)
sensor
reference
point
CLEF Range
Low Calibration
Point
Far
Range