Emerson Rosemount 5408 Reference Manual page 214

Configuration Parameters
November 2017
Track lower surface
Track the lower product surface, such as the interface when there are multiple products in the tank, or
the product surface instead of a foam layer.
Upper product dielectric constant
Enter the dielectric constant for the upper product. A more precise value results in better accuracy for
the lower surface level.
Double bounce handling
Use this function to prevent transmitter from locking on strong double bounce echoes (may occur in
spherical and horizontal cylinder tanks). See
more information.
Overfill prevention
The Overfill Prevention function adds an extra layer of protection to prevent tank overfills. The function
uses an independent echo logic algorithm to identify the surface echo close to the top of the tank.
In the unlikely event there is a conflict between the normal and the overfill prevention echo logic, the
Overfill Prevention function will have a precedence in determining the position of the surface. The
transmitter will then output this new value, or generate an alarm if the normal echo logic is not able to
find the surface echo at the new position.
The Overfill Prevention Range defines the lower end of the range in which the function operates. The
range is configurable. See
Figure C-17. Overfill Prevention Range
100% (20 mA)
0% (4 mA)
A. Device Reference Point
B. Overfill Prevention Range
202
Figure C-17
Rosemount 5408:SIS
80%
"Handling strong double bounce echoes" on page 111
for default factory settings.
A
20 in. (500 mm)
B
B
Reference Manual
00809-0100-4408, Rev BA
Rosemount 5408
Configuration Parameters
for