Handling Ghost Echoes In Still Pipes - Emerson Rosemount 5408 Reference Manual

7.5.3

Handling ghost echoes in still pipes

Ghost echoes may occur in still pipes because of multiple reflections between the pipe
wall, flange, and antenna. In the echo curve, these echoes appear as amplitude peaks at
various distances below the product surface, see
can eliminate ghost echo problems below the product surface. When enabled, the first
echo above threshold will always be considered as the surface echo.
Figure 7-13:
A.
B.
C.
D.
Enable the track first echo function
1.
2.
3.
4.
Rosemount 5408 and 5408:SIS Level Transmitters
Ghost Echoes in Still Pipes
Signal amplitude
Actual level
Virtual level
Distance
In Rosemount Radar Master Plus, read the echo curve. Make sure there are no
disturbing echoes above the product surface. See
Under Configure, select Level Setup > Advanced.
Under More Advanced Options, select Echo Tracking.
In the Surface Echo Tracking list, select User defined, and then select the Track First
Echo check box.
Service and Troubleshooting
Figure 7-13. The Track First Echo function
Section 7.4.1.
119