Siemens SITRANS LR560 Operating Instructions Manual page 168
Radar transmitters
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Also See for SITRANS LR560:
- Quick start manual (270 pages) ,
- Operating instructions manual (222 pages) ,
- Compact operating instructions (66 pages)
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The device characterizes all echoes that rise above the TVT as potential good echoes. Each
peak is assigned a rating based on its strength, area, height above the TVT, and reliability,
amongst other characteristics.
ALGORITHM (2.4.5.1.) (Page 100)
The true echo is selected based on the setting for the Echo selection algorithm. For a list of
options, see ALGORITHM (2.4.5.1.) (Page 100).
POSITION DETECT (2.4.5.2.) (Page 100)
The echo position detection algorithm determines which point on the echo will be used to
calculate the precise time of flight, and calculates the range using the calibrated propagation
velocity. The following options are available:
Rising: Uses rising edge of the echo.
Center: Uses center of the echo.
Hybrid: Uses the Center algorithm for the top part of the vessel, and the CLEF algorithm for
the part nearest the vessel bottom, according to the setting for CLEF range.
CLEF (Constrained Leading Edge Fit)
● Uses the leading edge of the echo.
● Is used mainly to process the echo from materials with a low dK value.
In an almost empty flat-bottomed vessel, a low dK material may reflect an echo weaker than
the echo from the vessel bottom. The echo profile shows these echoes merging. The device
may then report a material level equal to or lower than empty.
The CLEF algorithm enables the device to report the level correctly.
LR560 (PROFIBUS PA)
Operating Instructions, 06/2018, A5E34648471-AE
Technical reference
A.4 Echo processing
167
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