Siemens Sitrans LR250 Instruction Manual page 70

2.2.3.6.
2.2.3.6.1.
2.2.3.6.2.
2.2.4. TVT (Auto False Echo Suppression) setup
Note: Default settings in the parameter tables are indicated with an asterisk
(*) unless explicitly stated.
2.2.4.1.
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 below 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.
2.2.4.2.
Is used together with Auto Suppression Range (2.2.4.3.) to screen out false
echoes in a vessel with known obstructions
Suppression (2.2.4.2.) on page 114 for a more detailed explanation.)
1)
For an illustration, see
Echo Suppression
Page 64 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL
Noise
Echo Confidence
Indicates echo reliability: higher values represent better echo
quality. The display shows the echo confidence of the last
measurement. Echo Threshold (2.2.3.1.2.) defines the minimum
criterion for echo confidence.
Values (view only)
Related
Parameters
Open the menu View – Echo Profile.
Echo Strength
Displays the absolute strength (in dB above 1 µV rms) of the echo
selected as the measurement echo.
Values (view only)
Open the menu View – Echo Profile.
1)
TVT Hover Level
Auto False Echo Suppression
Before Auto False Echo Suppression
on page 65.
0 to 99
Echo Threshold (2.2.3.1.2.)
–20 to 99
Range: 0 to 100%
Default: 40%
(
see Auto False Echo
and
)
After Auto False
7ML19985JF02