Alert Setup - Emerson Rosemount 3308A Reference Manual

Configuration Parameters
August 2017
Figure D-6. Strapping Points
A. Actual tank bottom may look like this.
B. Using only three strapping points results in a level-to-volume profile that is more angular than the actual shape.
C. Using six of the points at the bottom of the tank yields a level-to-volume profile that is similar to the actual tank bottom.
D.3.4

Alert setup

Signal quality alert
Signal Quality is the product surface echo amplitude compared to the surface threshold and noise. The
Signal Quality spans from 0 to 10. A low value means that there is a risk for the noise peak to be mistaken
for the product surface peak.
Build up on the probe and different surface conditions are factors that can result in a low Signal Quality
value. By setting an alert, the Signal Quality value can be used to schedule maintenance to clean the
probe.
Note
The Signal Quality depends on probe type and application conditions, as well as the condition of the
probe. Even if the probe is clean, Signal Quality may not be a 10.
Suitable alert limits vary from application to application. Appropriate value can be determined by
logging Signal Quality over time and viewing maximum/minimum values. The Signal Quality Alert limit
should be at least 1, but a better guideline is 2-3.
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PRELIMINARY
A
B
C
Reference Manual
00809-0100-4308, Rev CA
Configuration Parameters