Siemens SITRANS LR 300 Instruction Manual page 81

Example After Auto False Echo Suppression
If the SITRANS LR 300 displays a full level, or if the reading fluctuates between a high
level and a correct level, set this parameter to elevate the TVT in this region and to de-
sensitize the receiver from any 'base noise' caused by internal antenna reflections and/or
nozzle echoes.
Entry:
0 = Off (not used).
1 = Use Learned TVT. (See Learned TVT Curve, in Example: After False Echo
Suppression, above.)
2 = Learn.
Set Up:
1. Perform this function at low tank levels.
2. Determine distance from radar unit to liquid level.
3. Select P838 and set [distance to liquid level minus 0.5m].
4. Select P837.
5. Press 2 and then press ENTER
automatically after a few seconds.
Notes:
• Press PROGRAM
• Press TOGGLE
7ML19985CL02
TVT curve
(Learned)
False echo
to toggle between RUN and PROGRAM mode.
twice to open parameter fields.
SITRANS LR 300 – INSTRUCTION MANUAL
. P 837 will revert to 1 (use Learned TVT)
Liquid
level
Page 79