Appendix A: Technical reference
A.2 Echo Processing
SITRANS LR250 with mA/HART
Operating Instructions, 10/2019, A5E32220602-AG
237
A.2.3 CLEF Range
CLEF Range (2.8.4.4.) is referenced from Low Calibration Point (process empty level ).
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)
High Calibration Point (process full level)
Low Calibration Point (process empty level )
A.2.4 Echo Threshold
Confidence (2.8.6.1.) describes the quality of an echo. Higher values represent higher
quality.
Echo Threshold (2.8.4.3.) defines the minimum confidence value required for an
echo to be accepted as valid and evaluated.
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