Signal Processing; Near Range; Far Range; Algorithm - Siemens SITRANS LR560 Operating Instructions Manual

2.7. Signal Processing

Note: Default settings in the parameter tables are indicated with an asterisk (*)
unless explicitly stated.

2.7.1. Near Range

The range in front of the device (measured from the sensor reference point)
within which any echoes will be ignored. This is sometimes referred to as
blanking or a dead zone.
Values
Related
parameters

2.7.2. Far Range

Note:
Allows the material level to drop below Low Calibration Point without
generating a Loss of Echo (LOE) state. See Sensor Mode (2.2.2.) on page 87 for
an illustration.
Values
Related
parameters
Use this feature if the measured surface can drop below the Low Cal. Point in
normal operation.
2.7.3. Echo Select
2.7.3.1.
Selects the algorithm to be applied to the echo profile to extract the true
echo.
Options
A5E34647946 SITRANS LR560 (mA/HART) – OPERATING INSTRUCTIONS
Range: 0 to 45 m (0 to 131.2 ft) for 40 m device
0 to 105 m (0 to 344.5 ft) for 100 m device
Default: 0.278 m (0.91 ft)
Units (2.2.1.)
Far Range can extend beyond the bottom of the vessel.
Min. = Low Cal. Pt.
Max. = 45 m (131.2 ft): 40 m device
= 105 m (344.5 ft): 100 m device
Default: Value for Low Calibration Pt. + 5 m (16.4 ft)
Units (2.2. 1 .)
CLEF Range (2.7.3.4.)

Algorithm

ALF Area Largest First
A
*
AL
AF
LF
BLF Best of First and Largest echo
BL
BF
LAST Last
TF
Echo Area
L Largest Echo
F First Echo
Echo Area Largest
Echo Area First
Echo Largest First
Best Largest Echo
Best First Echo
True First Echo
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