VEGA VEGASON 51P…53P Profibus PA - Manual (Page 54)

54 VEGASON 51P … 53P
Setup
Echo curve
With the menu item " Echo curve“ in the menu
window "Sensor optimisation“ you can see
the course and the strength of the detected
ultrasonic echo. If, due to vessel installations,
you expect strong false echoes, a correction
(if possible) of the mounting location and
orientation (during simultaneous monitoring of
the echo curve) can help localise and reduce
the size of the false echoes.
In the following illustration, you see the echo
curve with a false echo nearly as large as the
product echo (before correcting the sensor
orientation, i.e. pointing the sensor directly at
the product surface).
In the next illustration, you see the echo curve
after optimum orientation of the sensor to the
product surface (sensor axis perpendicular
to the product surface). The false echo, e.g.
caused by a strut, is now reduced by more
than 10 dB and will no longer influence the
measurement.
• Quit the menu " Echo curve“ with "
Quit“.
False echo storage
With the menu item " False echo storage“ in
the menu " Sensor optimisation“ you can au-
thorise the sensor to save false echoes. The
sensor electronics then saves the false ech-
oes in an internal database and assigns them
a lower level of importance than the useful
echo. Carry out the false echo storage in the
emptied vessel.
• Click in the menu window " Sensor optimisa-
tion“ to the menu item
"False echo storage“.