Reference Manual
00809-0100-4026, Rev FA
July 2009
Rosemount 5400 Series
7-6
Figure 7-3. Example 2: surface
threshold is too low.
By adjusting the surface threshold, the product surface is properly detected,
as illustrated in Figure 7-4:
Figure 7-4. Echo Curve after
surface threshold was adjusted
To adjust the amplitude thresholds, see “Using the Echo Curve Analyzer” on
page 7-9.
In the Echo Curve Analyzer in RRM, the amplitude threshold points can easily
be dragged to the desired values.
Amplitude, mV
Actual surface
Surface Threshold=
Amplitude Threshold
Curve (ATC)
Distance, m
P1 - Disturbing echo
misinterpreted as
product surface
Reference
Amplitude, mV
Distance, m
After Surface Threshold is
adjusted, the product surface is
correctly detected
Surface Threshold=
Amplitude Threshold
Curve (ATC)
Reference
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