Emerson Rosemount 5408 Reference Manual page 105

Reference Manual
00809-0100-4408, Rev BA
Analyze the echo curve
The following echo peaks may appear in the echo curve:
Table 7-8. Echo Peak Types
Type
Surface
Unknown
Suppressed
Suppressed
(double bounce)
Secondary
surface
Tank bottom echo
Figure 7-2. Echo Curve with Typical Echo Peaks
B
0
A. Suppressed (dashed line indicates use of false echo suppression)
B. False echo suppression
C. Unknown
D. Amplitude threshold
E. Surface
Service and Troubleshooting
Description
Echo tracked as the current surface echo
Echo not recognized by the device, which might interfere with measurement
Echoes that are identified but suppressed by the device
Echo managed as a double bounce echo by the Double Bounce function
Echo tracked as the current secondary surface (if Double Surface Handling function is
enabled)
Echo considered as an echo from the tank bottom
A
C
D
E
A
1 000 2 000 3 000 4 000
meter
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5 000 6 000 7 000 mV
Service and Troubleshooting
November 2017
93