3.5.6. TVT (Auto False Echo Suppression) setup
Note: If the Reform parameter has been used to reshape the echo profile, Auto False Echo Suppression must be
SITRANS LR 460 first learns the echo profile.Then the learned profile, or part of it, is used to screen out false echoes.(See Auto
To use Auto False Echo Suppression via SIMATIC PDM:
a.Determine 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 LR 460. Subtract 2 m (6.56 ft) from this distance, and use the resulting value.
b.Open the menu Device – Auto False Echo Suppression.
c.Enter the value for Range and click Set Range.
d.Click Learn. The On and Off buttons disappear while the new curve is being learned.
e.When the buttons reappear, click Close. Auto TVT is now on, and the learned TVT curve will be used.
f.To turn Auto False Echo Suppression off or on, reopen menu Device
– Auto TVT and click On or Off.
To use Auto False Echo Suppression via the handheld programmer:
3.5.6.1. Auto TVT (Auto False Echo Suppression)
| OFF |
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Values |
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ON | Enable Auto False Echo Suppression | ||
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| LEARN | "Learn" the TVT curve | |
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Related | • 3.5.2.5. Reform Echo (default 0) | ||
parameters | |||
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a.Go to 3.5.6.2. Range (Auto False Echo Suppression Distance) step a and enter the value.
b.Select Learn. The device will automatically revert to On (Use Learned TVT) after a few seconds.
3.5.6.2.Range (Auto False Echo Suppression Distance)
Defines the endpoint of the Learned TVT distance.
a.Determine the actual distance from the antenna reference point to the material surface. Use a rope or tape measure, and make allowances for the actual location of the LR 460. Subtract 2 m (6.56 ft) from this distance, and use the resulting value.
b.Enter the value for Range and press Right Arrow to accept it.
c.Go to 3.5.6.1. Auto TVT (Auto False Echo Suppression) . step b.
Parameters
7ML19985JM01 | SITRANS LR 460 – INSTRUCTION MANUAL | Page 57 |
