Rosemount 5401, Reference Manual

Page: 169 / 180

Reference Manual
00809-0100-4026, Rev FA
July 2009
C-9
Rosemount 5400 Series
Extra Echo Function
The Extra Echo Detection function makes for more robust measurements in
the bottom region for conical or domed bottom shape tanks. In this case, there
is no strong echo from the tank bottom when the tank is empty, and a virtual
echo beneath the actual tank bottom can sometimes be seen.
If the transmitter is unable to detect the tank bottom, this function can ensure
that the transmitter stays in Empty Tank state as long as an extra echo is
present.
Use the spectrum function in Rosemount Radar Master when the tank is
empty to verify if such an echo exists or not by entering a distance that
exceeds the tank bottom. The suitable values for Extra Echo Min Distance,
Extra Echo Max Distance and Extra Echo Min Amplitude can also be viewed
in the spectrum. The tank is considered empty when an echo is within the
minimum and maximum distance, and the amplitude is above the specified
limit.
Amplitude
Dis
tan
ce
Extra Ech
o
Min
. Dist
anc
e
Extra Echo
Max. Dis
tan
ce