7ML19985JB02 SITRANS Probe LU (PROFIBUS PA) – INSTRUCTION MANUAL Page 93
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H: Parameters
2.7.7. TVT setup
First SITRANS Probe LU learns the echo profile. Then the learned profile, or part
of the learned profile, is used to screen out false echoes.
2.7.7.1. TVT Hover Level
1
(default 33%)
Defines in percent how high the TVT (Time Varying Threshold) curve is
placed above the echo profile, with respect to largest echo. When
SITRANS Probe LU is located in the center of the vessel, lower this
parameter to prevent multiple echo detections.
2.7.7.2. TVT Type
Selects the TVT curve to be used.
2.7.7.7. Auto False Echo Suppression
Enables a ’learned’ TVT curve to be used in place of the default TVT curve.
Use this feature to ignore false echoes on the echo profile. Set Range
(Auto False Echo Suppression Distance) first.
a. Rotate the instrument for best signal (lower false-echo amplitude).
b. Go to Range, and set the value (see page 94).
c. Open the menu Device – Auto False Echo Suppression and select
the option to change it.
d. Select Learn. The device will automatically revert to On (Use
Learned TVT) after a few seconds.
1.
For an illustration, see
Display before Auto False Echo Suppression
and
Display after
Auto False Echo Suppression
, on page 94.
Values
Range: 0 to 100%
Hand
programmer
values
1
*
TVT short curve
2
TVT short flat
3
TVT long flat
4
TVT long smooth flat
5
TVT long smooth
6
TVT slopes
Hand programmer
values
0* Off
1 On
2Learn the TVT curve
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