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Reference Manual
00809-0100-4530, Rev BA
July 2009
7-7
Rosemount 5300 Series
DISTURBANCE ECHO
HANDLING
When the Basic Configuration is done, the transmitter may need a fine-tuning
to handle disturbing objects in the tank. The Amplitude Threshold Curve
(ATC) function can be used for disturbance echo handling with the
Rosemount 5300 Series transmitter.
Amplitude Threshold
Curve
As shown in Figure 7-5, the ATC can be designed to filter out single disturbing
echoes by adapting the curve around the corresponding amplitude peak. It is
important in this case that the disturbance is fixed at a certain tank level.
Disturbing echoes which may appear different from time to time can be filtered
out by raising the whole ATC.
Figure 7-5. Disturbing echoes
can be filtered out by creating an
amplitude threshold.
Disturbances at the Top
of the Tank
In addition to using the ATC, the Rosemount 5300 transmitter supports
alternative methods to filter out disturbances at the top of the tank, such as
the Trim Near Zone and the Upper Null Zone functions, which can be used to
handle disturbances from narrow nozzles or nozzles with rough edges. See
“Handling of Disturbances from Nozzle” on page C-4 for more information.
Amplitude Threshold Curve
Measurement signal
Amplitude, mV
Distance, m
Disturbing object