Echo Filtering - Burkert 8175 Manuel Utilisateur

4.4.5

Echo filtering

This function eliminates any fixed obstacles such as mounting elements, blades and inlet
pipes which may interfere with the transmitter measurement giving an incorrect value and
reading.
This function will only be available if a filter value between 3 and 9 has been selected within
the filter function - section 4.4.3
This function should only be used if the echo returned and the displayed
value is not that expected but corresponds to that of an obstacle within
the tank.
Steps for successful echo filtering
All obstacles to be identified must be between
-
the transmitter and selected target.
Enter the distance "1" between the base of the
-
sensor and the fluid surface and press 'Enter'
( fig.4.1 ) and the transmitter will process the
information for approx. 10 seconds.
The transmitter will search for an echo within
-
+/- 0.5m of the distance entered.
After processing the transmitter will display
-
upto 10 echos identified in decreasing power
order (the actual distance is generally the first
value displayed) or the message 'ERROR' will
be displayed.
Select the echo for the actual distance and
-
validate the procedure or exit.
If the message 'ERROR' is displayed there has
-
been no obstacles identified at the distance
entered.
NOTE:
After distance "1" has been validated, the transmitter searches for the possible other ob-
stacles ("2", "3" and "4") and memorizes them within the interference table (see the TEST
menu). During normal operation the transmitter searches for the level knowing that "2", "3"
and "4" correspond to obstacles.
To assist with the completion of this function a schematical diagram is displayed in the
-
next page.
The echoes "2", "3" and "4" identified and stored by this procedure can be erased by
-
the reset function within the test menu (interference table) - section 4.5.6.
8175
CALIBRATION MENU
35
Fig. 4.1 Echo Filtering