VEGA VEGAFLEX 54K - Manual (Page 30)

30 VEGAFLEX 54K
Setup
The following curves can be displayed:
Raw value curve (red)
The red curve represents the absolute sig-
nal, detected by the receiver of VEGAFLEX.
Beside the useful echo, this curve also con-
tains interference signals. The highest ampli-
tude is interpreted as the level echo. Check
by sounding if the value of the useful echo
corresponds to the real distance to the me-
dium. If the two values do not correspond,
you have to filter out the dominant false ech-
oes with the function "Empty vessel profile".
Vessel profile (blue)
In normal condition, this curve represents the
beginning and end of the vessel.
To filter out false echoes, you can modify the
blue curve of the vessel profile with the func-
tion "Empty vessel profile".
Reference line (green)
All amplitudes of the red curve which are
below the green reference line will be sup-
pressed (ringing, noise, false echoes, etc.).
All amplitudes above this line are possible
echoes that will be evaluated by the software.
Logarithmic raw value curve (black)
This curve represents the difference between
raw value curve (red) and reference line
(green). The scale on the right (dB) applies
to this curve.
Documentation
If you click the button "Documentation", the
immediate echo curve will be saved.
Echo data
If you click the button "Echo data", a window
is displayed in which all echoes detected by
the sensor are listed with dB information and
a probability evaluation.
Start
If you click "Start", the echo curve is updated
continuously. With "Stop" you can terminate the
update.
Empty vessel profile
With the functions in this window, you can filter
out false echoes. The blue empty vessel profile
curve in the echo curve window represents the
actual empty vessel profile.
Determine the level by sounding. It is possible
to filter out the echo if the sensor has inter-
preted a false echo as the probable level echo
instead of the sounded level. Choose the func-
tion "Create new". Enter the sounded distance
to the medium. All false echoes within the range
of the adjusted distance are gated out auto-
matically. Please note that the blue curve of the
empty vessel profile also changes.
With "Update" you can extend the empty vessel
profile, in case new false echoes appear when
the level falls.
If you want to delete the existing empty vessel
profile, click "Delete".
If VEGAFLEX is mounted on a socket or a
mounting boss, the measurement may be
inaccurate at close range. If the socket or
mounting boss exceeds the following lengths,
you should carry out an empty vessel profile
storage:
Thread 1", 1
1 /
2
" - length > 50 mm
Flange DN 50 - length > 50 mm
Flange DN 80 - length > 80 mm
Flange
≥
DN 100 - length > 100 mm