Emerson Rosemount 5408 Reference Manual page 252

Configuration Parameters
Table C-7:
Parameter
Bottom product dielectric constant
Maximum projection distance
Minimum tank bottom amplitude
Echo tracking
Surface echo tracking
Use these settings to configure how the transmitter should keep track of the surface.
These are advanced settings. Normally, they should not be changed.
Table C-8:
Parameter
Search window size
Track first echo
Double surface handling
If there are multiple products in the tank, the Double Surface Handling function can be
manually set to allow user to select if the upper or lower product should be used as output.
The upper and lower surface echoes must be stronger than any disturbance echoes in the
search region for Double Surface Handling to function properly.
242
Tank Bottom Projection
Surface Echo Tracking
Description
Enter the product dielectric constant for the
product in the bottom of the tank.
This defines the range where the function is ac-
tive. Enter the maximum distance from the zero
level (tank bottom).
Enter the minimum allowed amplitude for the
echo from the tank bottom before this function
is activated.
Description
This parameter defines a window centered at
the current surface position where new surface
echo candidates can be selected. The size of the
window is ±Search Window Size. Echoes outside
this window will not be considered as surface
echoes.
If there are rapid level changes in the tank, the
value of the Search Window Size can be in-
creased to prevent the transmitter from missing
level changes. On the other hand, a large value
may cause the transmitter to select an invalid
echo as the surface echo.
Select the Track First Echo check box if the first
echo above threshold always should be consid-
ered as the surface echo (see Section 7.5.3).
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