Emerson Rosemount 3308 Series Reference Manual page 124

Service and troubleshooting
February 2020
Figure 6-4: Surface Threshold Is Too Low
A. Amplitude
B. Distance
C. Disturbing echo misinterpreted as product surface
D. Actual product surface
By adjusting the Surface Threshold the product surface is properly detected as illustrated
in Figure
Figure 6-5: Echo Curve Plot after Surface Threshold Was Adjusted
A. Amplitude
B. Distance
C. After Surface Threshold is adjusted the product surface is correctly detected.
Example 2: Interface peak not found
In interface applications where the bottom product has a relatively low dielectric constant
(<40), or if the signal is attenuated in the upper product, the amplitude of the reflected
signal from the interface is relatively low and difficult for the transmitter to detect. In such
a case it may be possible to detect the reflected signal from the interface if the Interface
Threshold is adjusted.
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Reference Manual
00809-0100-4308
Rosemount 3308 Series