Table 7-1: Echo Peak Types
Type
Description
Surface
Echo tracked as the current surface echo
Unknown
Echo not recognized by the device, which might
interfere with measurement
Suppressed
Echoes that are identified but suppressed by the
device
Suppressed (double bounce)
Echo managed as a double bounce echo by the
Double Bounce function
Secondary surface
Echo tracked as the current secondary surface (if
Double Surface Handling function is enabled)
Tank bottom echo
Echo considered as an echo from the tank
bottom
Figure 7-16: Echo Curve with Typical Echo Peaks
C
meter
0
0
1 000
2 000
3 000
4 000
5 000
6 000
7 000
mV
0.5
1.0
1.5
2.0
2.5
3.0
3.5
D
A
E
A
B
A. Suppressed (dashed line indicates use of false echo suppression)
B. False echo suppression
C. Unknown
D. Amplitude threshold
E. Surface
Reference Manual
Service and troubleshooting
00809-0100-4418
September 2022
Rosemount 3408 Level Transmitter
87