Siemens LR250 Instruction Manual page 141

CLEF Range (2.8.4.4.)
CLEF Range is referenced from Far Range. When the Hybrid algorithm is selected in
Position Detect (2.8.4.2.), the CLEF algorithm will be applied up to the limit of CLEF Range.
Above this limit the Center algorithm will be applied.
(Center
algorithm
applied)
CLEF Range
Echo Threshold (2.8.4.3.)
Confidence (2.8.6.1.) describes the quality of an echo. Higher values represent higher
quality. Echo Threshold defines the minimum confidence value required for an echo to be
accepted as valid and evaluated.
Echo Lock (2.8.5.1.)
If the echo selected by Algorithm is within the Echo Lock window, the window is centered
about the echo, which is used to derive the measurement. In radar applications, two
measurement verification options are used:
Lock Off
SITRANS LR250 responds immediately to a new selected echo (within the restrictions set
by the Maximum Fill / Empty Rate), but measurement reliability is affected.
Material Agitator
A new measurement outside the Echo Lock Window must meet the sampling criteria
before the window will move to include it.
The other available options, Maximum Verification and Total Lock are not recommended
for radar.
7ML19985JE06
High
Calibration
Point
(process full
level)
SITRANS LR250 (HART) – INSTRUCTION MANUAL
sensor
reference
point
Far Range
Page 133