7ML19985JF02 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL Page 65
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Parameters
a) Determine Auto Suppression Range. Measure the actual distance
from the sensor reference point to the material surface using a rope
or tape measure.
b) Subtract 0.5 m (20") from this distance, and use the resulting value.
To set Auto False Echo Suppression via SIMATIC PDM:
(For more detailed instructions see
Auto False Echo Suppression
on page
44.)
c) Open the menu Device – Auto False Echo Suppression and set Range
to the value calculated in step b).
d) Select Learn. The device will automatically revert to On (Use
Learned TVT) after a few seconds.
See
To set Auto False Echo Suppression via the handheld programmer:
on
page 66.
Notes:
• Make sure material level is below all known obstructions at the
moment Auto False Echo Suppression is used to learn the echo
profile. (An empty or almost empty vessel is recommended.)
• Note the distance to material level and set Auto Suppression Range
to a shorter distance to avoid the material echo being screened out.
• Set Auto False Echo Suppression and Auto False Echo Range during
startup, if possible.
• If the vessel contains an agitator it should be running.
• Before adjusting these parameters, rotate the instrument for best
signal (lower false-echo amplitude).
echo marker
echo
marker
default
TVT
After Auto False Echo Suppression
liquid
level
learned
TVT curve
false echo
TVT
Hover Level
Before Auto False Echo Suppression
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