User's Manual

7ML19985LT01 SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS Page 75
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Parameters
2.4.8. TVT setup
2.4.8.1. Auto False Echo Suppression
Used together with Auto False Echo Suppression Range (2.4.8.2.) 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 Auto False Echo Suppression (2.4.8.1.) on page 118 for a more
detailed explanation.
• To set via SIMATIC PDM see
Auto False Echo Suppression on page
48
.
• To set via local operation see
AFES (Auto False Echo Suppression)
Wizard 1.2. on page 63
.
2.4.8.2. Auto False Echo Suppression Range
Defines the e ndpoint of the Learned TVT distance. Units are defined in Unit
(2.3.1.). Used in combination with Auto False Echo Suppression (see above).
2.4.8.3. Hover Level
Defines how high the TVT (Time Varying Threshold) is placed above the
noise floor of the echo profile, as a percentage of the difference between
the peak of the largest echo in the profile and the noise floor. (See Before
Auto False Echo Suppression on page 49 for an illustration.
)
When the device is located in the center of the vessel, the TVT hover level
may be lowered to increase the confidence level of the largest echo.
2.4.8.4. Shaper Mode
Enables/disables TVT shaper (2.4.9.).
Note: We recommend setting Auto False Echo Suppression either viaSI-
MATIC PDM or via local operation using the Auto False Echo Suppres-
sion wizard.
Values
Range: 0.00 to105.00 m
Default: 1.00 m
Values
Range: 0 to 100%
Default: 40%
Options
*OFF
ON