Tvt Setup; Auto False Echo Suppression - Siemens SITRANS LR560 Operating Instructions Manual
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2.7.5.3.
The fraction of the old shot data that is kept for averaging purposes. A
higher value will give a smoother profile at the expense of a slower echo
profile response. It may be necessary to reduce this value to a very low
number for FAST applications.
Values
2.7.6. Echo Quality
2.7.6.1.
Indicates echo reliability: higher values represent better echo quality. The
display shows the echo confidence of the last measurement. Echo
Threshold (2.7.3.2.) defines the minimum criterion for echo confidence.
Values (view only)
Related Parameters
Open the menu Device – Echo Profile Utilities and click on the tab Echo
Profile.
2.7.6.2.
Displays the absolute strength (in dB above 1 μV rms) of the echo selected
as the measurement echo.
Values (view only)
Open the menu Device – Echo Profile Utilities and click on the tab Echo
Profile.
2.8. TVT setup
Note: Default settings in the parameter tables are indicated with an asterisk (*)
unless explicitly stated.
2.8.1. Auto False Echo Suppression
Note:
SIMATIC PDM or via local operation using the Auto False Echo Suppression
wizard.
Used together with Shaper Mode (2.8.4.) to screen out false echoes in a vessel
with known obstructions. A 'learned TVT' (time varying threshold) replaces the
default TVT over a specified range.
•
See
•
To set via SIMATIC PDM, see
•
To set via local operation, see
on page 84.
Page 100
SITRANS LR560 (mA/HART) – OPERATING INSTRUCTIONS
Average Amount
0.0 to 0.99
Default: 0.75
Confidence
0 to 99
----
Echo Threshold (2.7.3.2.)
Echo Strength
–20 to 99
We recommend setting Auto False Echo Suppression either via
Shaper Mode (2.8.4.)
Shot not used
on page 137 for a more detailed explanation.
Auto False Echo Suppression
AFES (Auto False Echo Suppression) Wizard
on page 52.
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