Siemens SITRANS LR 300, Instruction Manual, Page: 81 / 140

7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 79
mmm
mm
Pa
ra
m
ete
rs
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
. P 837 will revert to
1
(use Learned TVT)
automatically after a few seconds.
Notes:
• Press PROGRAM to toggle between RUN and PROGRAM mode.
• Press TOGGLE twice to open parameter fields.
Example After Auto False Echo Suppression
TVT curve
(Learned)
Liquid
level
False echo
SITRANS LR 300.book Page 79 Monday, June 10, 2002 7:18 PM