Emerson Rosemount 5900C, Справочное руководство

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Figure 4-4: The Tank Scan Window
When the Tank Scan window is opened, the system starts reading tank data from
the gauge (indicated by a progress bar in the lower right-hand corner).
Tank scan window
The Tank Scan window contains the Graph Area, Legend/Options area, File Storage
buttons, and various action buttons.
The Tank Echo curve shows the measurement signal in graphical form. In addition to the
surface echo there might be echoes from obstacles in the tank.
In the graph area you can configure the gauge to filter out echoes that originate from
obstacles in the tank in order to facilitate tracking of the product surface echo.
The tank echo and echo peaks can be refreshed at any time with the Reread From Gauge
button. The new echo curve will be shown as a black line and the previous curve as a grey
line. The graph may show up to two old echo curves. An old echo peak will be marked by a
small cross. This can be used to compare the existing tank signal with previous signals.
See the Rosemount Tank Gauging System Configuration Manual for more information on
how to use the Tank Scan function.
4.4.3 Empty tank handling
The Empty Tank Handling function handles situations when the surface echo is close to the
tank bottom. It has the ability to:
• track weak product echoes
• handle lost echoes
If the surface echo is lost this function makes the Rosemount 5900C present a zero-level
measurement.
Configuration Reference Manual
September 2019 00809-0100-5901
128 Reference Manual