Siemens SITRANS L Operating Instructions Manual page 138

Parameter reference
To use Auto False Echo Suppression via AMS Device Manager note value calculated in
step 1 and see Auto False Echo Suppression (Page 82).
Auto False Echo Suppression Range (2.5.10.2.)
Defines the endpoint of the Learned TVT distance. Units are defined in Unit (2.3.1.).
Values
1. Press RIGHT arrow to open Edit mode.
2. Enter the new value and press RIGHT arrow to accept it.
3. Set Auto False Echo Suppression (2.5.10.1.).
Hover Level (2.5.10.3.)
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 Auto False Echo Suppression (2.5.10.1) for an illustration.
Values
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.
Shaper Mode (2.5.10.4.)
Enables/disables TVT shaper (2.5.11.)
Options
TVT Shaper (2.5.11.)
Note
• The range is –100 to +100 bits. With 2 bits per dB this gives a range of –50 to +50 dB.
• Shaper Mode (2.5.10.4.) must be turned ON in order for TVT shaper points to be
transferred.
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 40 breakpoints arranged
in 5 groups. (We recommend using SIMATIC PDM to access this feature.)
138
Range: 0.00 to 30.00 m
Default: 1.00 m
Range: 0 to 100%
Default: 40%
ON
* OFF
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH