Emerson Rosemount 5708, Справочное руководство

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113
Reference Manual
00809-0100-4570, Rev DA
Operation
November 2017
Operation
Figure 7-74. False Echo Example in Echo Curve Analysis Window
5. Zoom into the area of false echoes at the first 1.5 m by clicking and dragging down and to the right
marking a square around the required area. This is done to view the exact numbers that later needed
to be mapped out under the False Echo Mapping function.
6. Check the Map Out False Echoes check box, select the required tab or beam on which you would like to
perform the false echo mapping, using the mouse left click mark a rectangle around the false echo
you wish to map and release the mouse button. The
Echo Mapping window will pop up populating all
relevant fields, Click Start Scanning to initiate the operation.
7. False Echo Mapping can be also found under the Device menu. Manually scan from 0 to beyond the
distance of the false echoes. In this case, the echo will be 1.6 m. Select Manual Scan, set the range of
scan and the level of the threshold, in this case it can be 10000.
8. Select the Start Scanning button.
9. Once the message disappears, the False Echo Mapping process is completed. Wait a couple of
minutes and perform Echo Curve Analysis again to verify the position of the User False Echo line (pink)
in each of the beams the operation was done. Wait at least one damping time before the algorithm
takes effect of the changes and completely ignores the false echoes.
Note
This is a brief run through of the False Echo Mapping process. There are many other situations that may
call for different techniques. An improper mapping of a vessel can lead to a poor performance.