Rosemount 5600 Series, Справочное руководство

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Reference Manual
00809-0100-4024, Rev BA
September 2005
4-11
Rosemount 5600 Series
ADVANCED FUNCTIONS
In some cases the transmitter must be further configured using the Advanced
Functions. Please note this may affect the previous basic configuration by
updating some parameters already set.
Disturbance Echo
Handling
There are three methods available for Disturbance Echo Handling:
• General Amplitude Threshold
• Customized Noise Threshold Table
(Amplitude Threshold Points [ATP] table)
• Registration of False Echoes
There are guidelines on when to register a false echo and what the Auto
Configuration does.
Figure 4-2. Disturbance Echoes
The False Echo function is used to improve the performance of the transmitter
when the surface is close to a horizontal surface of a stationary object in the
tank. The object causes an echo when it is above the surface. When the
echoes from the surface and the object are close to each other, they might
interfere and cause a decrease in performance.
It is possible to store the positions of the disturbing objects in the memory of
the transmitter. When the surface is passing by a disturbing object, the
transmitter can measure with a higher reliability, when the position of the
object is registered.
Use a spectrum plot to find the disturbance echoes. Remember to update it
several times to get the whole picture of disturbance echoes in the tank. Do
not base the false echo registration on only one updated spectrum plot. (See
Figure 4-3).
Echo from
disturbing objects
Surface echo
Disturbing objects
Surface
5600_C_03A.EP
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