Emerson Rosemount 5900C, Reference Manual

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If the tank is empty the level gauge searches for the product surface in a region 2 x Empty
Tank Detection Area. It is important that there are no disturbances in this area, since when
a new echo is found it is considered to be the product surface. To ensure robust
measurements in this region, disturbances may need to be filtered out.
The Empty Tank Detection Area is used in case there is no visible bottom echo. The
Bottom Echo Visible if Tank is Empty function shall be disabled.
Figure 4-8: Empty Tank Detection Area
$ %
A. Minimum 200 mm (8 in.)
B. Empty Tank Detection Area (If the product surface is lost in this region the tank is
considered empty.)
Configuration Reference Manual
September 2019 00809-0100-5901
132 Reference Manual