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Appendix A: Technical reference
A.2 Echo processing
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
239
Auto False Echo Suppression Range must be set to a distance shorter than the distance to the
material level when the environment was learned, to avoid the material echo being screened
out.
Example before Auto False Echo Suppression
①
Default TVT
⑤
High calibration point = 0
②
False echo
⑥
Obstruction at 1.3. m
③
Material echo
⑦
Material level at 3.2 m
④
Sensor reference point
Example after Auto False Echo Suppression
Auto False Echo
Suppression
Range set to 2 m
①
Learned TVT
④
Default TVT
②
False echo
⑤
Material echo
③
Auto False Echo Suppression Range
⑥
Echo marker