User's Manual

7ML19985LT01 SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS Page 63
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Parameters
1.2. AFES (Auto False Echo Suppression) Wizard
If you have a vessel with known obstructions, we recommend using AFES to prevent false
echo detection.
This feature can also be used if SITRANS LR560 displays a false high level, or the reading
is fluctuating between the correct level and a false high level.
a) Make sure the material level is below all known obstructions.
b) Navigate to Level Meter > Diagnostics
(3.) > Echo Profile (3.1.) and press
RIGHT arrow to request a profile.
c) Determine a range that includes the
false echo but not the true echo: in the
example, 3.3 m.
d) Open the AFES wizard and press
DOWN arrow to continue.
e) Press RIGHT arrow to edit Auto
False Echo Suppression Range.
f) Enter the new range value and press
RIGHT arrow to transfer it.
g) Press DOWN arrow to initiate
Learn. A transition screen appears,
followed by the message Wizard
Complete.
h) Press DOWN arrow (Finish) to
save AFES parameter changes and return to Program menu.
(continued on next page)
Notes:
• Before using AFES, configure the device via the Quick Start wizard.
• Make sure material level is below all known obstructions at the moment Auto False
Echo Suppression is used to learn a custom TVT (Time Varying Threshold). We
recommend an empty or almost empty vessel.
• Note the distance to material level when the environment is learned, and set Auto
False Echo Suppression Range to a shorter distance to avoid the material echo being
screened out.
false
echo
true echo
AFES range