7ML19985JF02 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL Page 45
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SIMATIC PDM
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. During this process all buttons are inaccessible. Unless calculation is
instantaneous buttons may disappear until it is complete.
5) When buttons are visible click on Close. Auto TVT is enabled and the learned TVT
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.
TVT Shaper
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 (2.2.4.2.)
on page 114.)
Open the menu Device – TVT Shaper
• Press Measure to refresh the echo profile and load the current TVT curve from the
device.
• Change the position of the cursor on the TVT curve using the Point+ and Point–
buttons: raise and lower the curve using Offset+ and Offset–.
• Alternatively, enter values for Point and Offset directly into the dialog boxes.
• If desired click on the TVT breakpoints tabs to see settings, then press Transfer to
Device.
TVT curve
cursor
echo profile
Note:
Double click on each
axis and record the
Xscale and Data
Scale values, so that
you can restore the
default view by
resetting to these
values.
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