Siemens SITRANS LR560 Operating Instructions Manual page 106

2.4.8. TVT (Auto False Echo Suppression) Setup
Notes:
• Default settings in the parameter tables are indicated with an asterisk (*)
unless explicitly stated.
• We recommend using AFES Wizard. See
Suppression) Wizard1.2.
2.4.8.1.
Used together with Auto False Echo Suppression Range (2.4.8.2.) to screen
out false echoes in a vessel with known obstructions. A 'learned TVT' (time
varying threshold) replaces the default TVT over a specified range.
a)
b)
c)
Before Auto False
Echo Suppression
Page 100 SITRANS LR560 (FF) – INSTRUCTION MANUAL
on page 87.
Auto False Echo Suppression
Make sure material level is below all known obstructions when
Auto False Echo Suppression is used to learn the echo profile. (An
empty or almost empty vessel is recommended.)
Determine Auto False Echo Suppression Range. Measure the actual
distance from the sensor reference point to the material surface
using a rope or tape measure.
Subtract 0.5 m (20") from this distance, and enter the resulting value
in Auto False Echo Suppression Range.
TVT Hover
Level
AFES (Auto False Echo
false echo
material
level
default TVT
echo marker
7ML19985LY01