Emerson Rosemount 5900S Series, Справочное руководство

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Empty tank handling
The Empty Tank Handling function facilitates surface tracking close to the tank bottom for
products with a low dielectric constant. Such products are relatively transparent for
microwaves, and strong echoes from the tank bottom may interfere with the relatively
weak measurement signal from the surface. Using this function may therefore improve
measurement performance when the product surface is close to the tank bottom.
In case the product surface echo is lost in the Empty Tank Detection Area close to the tank
bottom, the device will enter Empty Tank state and an Invalid Level alarm is triggered.
Figure 4-26: Empty Tank Configuration
The Extra Echo Detection function is used for tanks with a dome or conical bottom shape
provided the tank bottom does not produce a strong echo when the tank is empty. For
tanks with a conical bottom, an echo may appear beneath the actual tank bottom when
the tank is empty. If the device is not able to detect the tank bottom this function can be
used to ensure that the device stays in empty tank state as long as this extra echo is
present.
For further details see Empty tank handling .
Reference Manual Configuration
00809-0100-5900 September 2019
Rosemount 5900S Radar Level Gauge 169