Emerson Rosemount 5408 Reference Manual page 110

Service and Troubleshooting
November 2017
Figure 7-6. Suppression of False Echoes
B
A. Amplitude threshold
B. Disturbing object
C. False echo suppression
D. Suppressed echo
E. Surface
Prerequisites
Follow these recommendations before suppressing new false echoes:
Make sure a correct amplitude threshold is set (see

Make sure the level is stable. A fluctuating level may indicate a temporary disturbance which is not due

to an interfering object.
Only suppress echoes which can be clearly identified as objects in the tank. Compare the list of

interfering echoes with the tank drawing or visual inspection of the tank.
Do not suppress false echoes located below the product surface.

Keep the number of suppressed false echoes to a minimum.

It may be necessary to suppress new false echoes at a later stage when objects have become visible due
to surface movement.
Procedure
Rosemount Radar Master Plus
To add a new false echo suppression:
1. Under Service Tools, select Echo Curve.
2. In the echo curve, click
98
A
C D
E
0 1 000 2 000 3 000 4 000
at the unknown echo peak, and then select Suppress.
meter
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5 000 6 000 7 000 mV
"Set amplitude thresholds" on page
Reference Manual
00809-0100-4408, Rev BA
96).
Service and Troubleshooting