Clef Range; Echo Marker - Siemens SITRANS LR560 Operating Instructions Manual

2.7.3.4.
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 (2.7.3.4.) on page 136.
Values
Related
parameters

CLEF Range

2.7.3.5.
The point on the selected echo from which the measured value is taken.
Values
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%.
A5E34647946 SITRANS LR560 (mA/HART) – OPERATING INSTRUCTIONS
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 (2.7.3.3.)
Far Range (2.7.2.)

Echo Marker

Range: 5 to 95%
Default: 70%
0 to 105 m (100 m device)
Low Calibration
Point
sensor
reference
point
Far
Range
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