User's Manual

Page 90 SITRANS LR560 (mA/HART) – INSTRUCTION MANUAL 7ML19985KB01
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Parameters
2.7.3.4. 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 (2.7.3.4.) on page 125.
2.7.3.5. Echo Marker
The point on the selected echo from which the measured value is taken.
Use this feature if the reported material level fluctates slightly due to a
variable rise in the leading edge of the true echo on the Echo Profile.
Enter the value (in percent of echo height) to ensure the Echo Lock window
intersects the Echo Profile at the sharpest rising portion of the Echo Profile
representing the true echo. This value is preset to 70%.
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 (2.7.3.3.)
Far Range (2.7.2.)
Values
Range: 5 to 95%
Default: 70%
sensor
reference
point
CLEF Range
Low Calibration
Point
Far
Range