Burkert Type 8175 - Manual (Page 103)

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8175
ENGLISH
CALIBRATION MENU
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.
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.
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.
Fig. 4.1 Echo Filtering