Siemens Sitrans LR250, Руководство по эксплуатации, Страница: 127 / 306

Parameter reference
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 08/2014, A5E32221386-AC
125
Auto False Echo Suppression (2.5.10.1.)
Used together with Auto False Echo Suppression Range (2.5.10.2.) 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. See Auto False Echo Suppression (Page 232) for a more
detailed explanation.
Note
•
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.)
•
Note the distance to material level when Auto False Echo learns the environment. Set
Auto False Echo Suppression Range to a shorter distance to avoid the material echo
being screened out.
•
Set Auto False Echo Suppression and Auto False Echo Suppression Range during
startup, if possible.
•
If the vessel contains an agitator it should be running.
•
Before adjusting these parameters, rotate the device for best signal (lower false-echo
amplitude).
Before Auto False Echo Suppression
①
TVT Hover Level
④
echo marker
②
default TVT
⑤
material level
③
false echo