Echo Tuning - Emerson Rosemount 3308A Reference Manual

Configuration Parameters
August 2017
D.3.5

Echo Tuning

Thresholds
Figure D-10. Thresholds
A. Reference Threshold
B. Surface Threshold
C. Interface Threshold
D. Probe End Threshold
Threshold control
Thresholds can be automatically calculated by device or manually set by user. This setting is valid for all
thresholds on the Thresholds tab (Surface, Interface Reference, and Probe End Thresholds).
Surface threshold
Threshold to filter out noise in the echo curve for detection of the Surface. Noise below the threshold is
suppressed. The first echo peak closest to the device that crosses and is above the Surface Threshold is
the surface echo.
Interface threshold
Threshold to filter out noise in the echo curve for detection of the Interface. The first echo peak after the
surface echo that crosses and is above the Interface Threshold is the interface echo.
Reference threshold
Threshold to filter out noise in the echo curve for detection of the Reference peak. The reference peak is
a strong negative echo very close to the device.
Probe end threshold
Threshold to filter out noise in the echo curve for detection of the Probe End peak. The probe end peak is
a fairly strong positive or negative echo (depending on probe type) that is present at the probe end when
tank is empty.
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PRELIMINARY
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DISTANCE
Reference Manual
00809-0100-4308, Rev CA
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D
Configuration Parameters