Tvt Shaper - Siemens SITRANS LR260 Operating Instructions Manual

SITRANS LR260 first learns the echo profile. Then the learned profile, or part of it, is used to
screen out false echoes. (See Auto False Echo Suppression (Page 87)for a more detailed
explanation.)
1. Determine Auto Suppression Range (the distance within which the learned TVT will replace
the default TVT). Measure the actual distance from the antenna reference point to the
material surface using a rope or tape measure, and make allowances for the actual location
of the LR260. Subtract 2 m (6.56 ft) from this distance, and use the resulting value.
2. Open the menu Device – Auto False Echo Suppression.
3. Enter the value for Auto Suppression Range and click on Set Range.
4. Click on Learn. While the new curve is being learned, all buttons are inaccessible. Unless
calculation is instantaneous, buttons will disappear until it is complete.
5. When buttons are visible, click on Close. Auto TVT is now on, and the learned TVT curve will
be used.
6. To turn Auto False Echo Suppression off or on, reopen menu Device – Auto False Echo
Suppression and click on Off or On.
7.1.5.6

TVT Shaper

Note
Record the default X-Scale (horizontal axis) and Data Scale (vertical axis) values so that you
can restore the default view by resetting to these values.
This feature allows you to manually adjust the TVT curve to avoid false echoes caused by
obstructions. For an explanation see Auto False Echo Suppression. (Page 87)
Open the menu Device – TVT Shaper.
SITRANS LR260 with mA/HART
Operating Instructions, 11/2019, A5E32337683-AD
Operating
7.1 Operating via SIMATIC PDM
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