Emerson Rosemount 5900C, Reference Manual

Page: 135 / 322

Close Distance
This parameter defines a window centered at the current surface level in which new
surface echo candidates can be selected. The size of the window is ±Close Distance.
Echoes outside this window will not be considered as surface echoes. The level gauge will
immediately jump to the strongest echo (highest amplitude) inside this window. If there
are rapid level changes in the tank, you may need to increase the Close Distance window in
order to prevent the gauge from missing any level changes. On the other hand, if the Close
Distance window is too large, the gauge might select an invalid echo as the surface echo.
Slow Search
The Slow Search function controls the search behavior if the product surface echo is lost,
and may typically be used for tanks with turbulent conditions. The gauge starts searching
for the surface at the last known product level, and gradually increases the search region
until the product surface is found. When this function is disabled, the gauge searches
through the whole tank.
Search Speed
The Search Speed parameter indicates how quickly the search region (Slow Search
window) is expanded when the Slow Search function is active.
Reference Manual Configuration
00809-0100-5901 September 2019
Rosemount 5900C Radar Level Gauge 135