User's Manual

Page 94 SITRANS LR560 (mA/HART) – INSTRUCTION MANUAL 7ML19985KB01
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Parameters
2.8.2. Auto False Echo Suppression Range
Defines the endpoint of the Learned TVT distance. Units are defined in Units
(2.2.1.). Used in combination with Auto False Echo Suppression (see above). .
2.8.3. 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 47 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.
2.8.4. Shaper Mode
Enables/disables the TVT shaper.
2.9. TVT shaper
Adjusts the TVT (Time Varying Threshold) at a specified range (breakpoint on the
TVT). This allows you to reshape the TVT to avoid unwanted echoes. There are 120
breakpoints.
To use TVT shaper via SIMATIC PDM:
a) Go to Level Meter > Setup > Signal Processing > TVT setup > Shaper Mode
and select On.
b) Open the menu Device – Echo Profile Utilities and click on TVT Shaper.
Values
Range: 0.00 to 45.00 m (or 105.00 m depending on
model)
Default: 1.0 0 m
Related parameters Units (2.2.1.)
Values
Range: 0 to 100%
Default: 40%
Options
ON
*OFF
Note:
• Shaper Mode (2.8.4.) must be turned ON in order for TVT breakpoints to be
transferred.
• We recommend using SIMATIC PDM to access this feature
Values
Range: –50 to 50 dB
Default: 0 dB