Page 38 SITRANS Probe LU (PROFIBUS PA) – INSTRUCTION MANUAL 7ML19985JB02
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A: Technical Reference
When you set Auto False-Echo Suppression to Learn, the instrument learns the echo
profile at that moment
1
. Then it uses the learned profile instead of the default TVT curve,
for the distance set in Auto False Echo Suppression Distance. The learned profile
(learned TVT curve) follows the echo profile, so that no large false echoes rise above the
learned TVT curve. From the end of the Auto False-Echo Suppression Distance, the
default TVT curve is used. The material level echo rises above this, and is selected as the
true echo.
1.
Turn on Auto False-Echo Suppression when the material level is substantially lower than process
full level (ideally when the tank is empty or almost empty).
Display before Auto False Echo Suppression
default TVT
curve
TVT
Hover Level
false
echo
true
echo
Distance (meters)
Level (db)
Display after Auto False Echo Suppression
TVT curve
(learned)
material
level
false
echo
Distance (meters)
Level (db)
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