Emerson Rosemount 5900C, Reference Manual

Page: 130 / 322

You can find out if such an echo exists by using the Tank Scan function when the tank is
empty. Ensure that the scan extends below the tank bottom. The tank spectrum can be
used to find suitable values for parameters such as the Extra Echo Min Distance, Extra Echo
Max Distance and Extra Echo Min Amplitude. The tank is considered empty when an echo
appears within the Min and Max Distance at an amplitude above the specified threshold.
Extra Echo Min Distance
Defines the minimum distance to the extra echo. This parameter should be greater than
the Tank Height.
Extra Echo Max Distance
Defines the maximum distance to the extra echo. This parameter should be greater than
the Extra Echo Min Distance.
Extra Echo Min Amplitude
Defines the minimum signal strength of the extra echo. If the signal strength exceeds this
value and is found in the region between Min Distance and Max Distance, the device stays
in empty tank state and presents Level=0.
Figure 4-6: Extra Echo Function
$
& '
%
A. Amplitude
B. Distance
C. Extra Echo Max. Distance
D. Extra Echo Min. Distance
Configuration Reference Manual
September 2019 00809-0100-5901
130 Reference Manual