Emerson Process Management ROSEMOUNT 5300 - Manual (Page 261)

Reference Manual
00809-0100-4530, Rev BA
July 2009
C-13
Rosemount 5300 Series
Use Automatic Echo Tracking Settings
When this check-box is selected, the transmitter automatically sets the echo
tracking parameters to a constant value based on the configured tank
environment and measurement mode.
Echo Timeout: defines the time in seconds before the device should start to
search for a surface echo outside the Close Distance window after it was lost.
After an echo was lost, the device does not start searching (or set Invalid
Level) until the specified time has elapsed. In some applications, especially
with solid products or applications with foam, the surface echo may disappear
for periods of time. This value can be increased to prevent the device from
entering alarm mode too early after the surface is lost.
Close Distance: defines a window centred at the current surface position
where 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 device will without delay jump to the strongest echo
within this window. This value can be increased if there are rapid level
changes in the tank. If the value is too large the device might select an invalid
echo as the surface echo.
Damping
The Damping parameter defines how fast the device reacts to a change of the
level value (step response). A high value makes the level steady but the
device reacts slowly to level changes in the tank. A low value makes the
device react quickly to level changes but the presented level value can be
somewhat jumpy. The default value is 2 seconds. Note that increasing the
damping value will also prolong the system response time. The damping
value can also be changed from the Output, General tab.