Emerson Rosemount 3100 Series - Learn about Echoes from False Targets (the 3101)

Reference Manual
00809-0100-4840, Rev. BA
July 2008
Rosemount 3100 Series
4-10
b) Ensure the target is the 20 mA level and, with the display indicating that
level, press the blue button
→.
c) The display indicates the present 20 mA level setting, not the new level
reading. If this value is correct, press the red button
↵ and then the green
button to get to the next menu option.
d) Press the blue button
→ to start editing. The display flashes alternately
“20” and the new level reading.
e) Press the blue button
→ to confirm the new level reading is the new
20 mA level.
f) If the new 20 mA level is correct, press the red button
↵ to save. The
display changes to the next menu option.
g) If the new 20 mA level is incorrect, press the blue button
→ to exit to the
menu. The menu option “S-20” re-appears; re-start at step (b) or press
↓
for the next menu option.
Learn About Echoes
From False Targets
(The 3101)
The Rosemount 3101 has an easy-to-use “Lrn” (Learn) routine that allows
the instrument to learn up to two false echoes, which can then be ignored in
future operations.
If the application is simple and there are no false echoes, press the green
button
↓ to exit the integral display menu and return the instrument to
indicating the level reading on the display.
After the transmitter is in operational, if an echo other than the true liquid
surface echo is detected and an incorrect level reading is indicated, the
instrument can learn to ignore this false echo. The “Lrn” routine may be used
at any time, either during or after setting-up or if a problem occurs later.
NOTE:
See Figure C-1 on page C-2 for a map of the programming menu structure
and how to access all the menu options.
To store a false target echo:
a) If entering the menu system from the PV display, press the green button
↓
repeatedly until the “Lrn” menu option is indicated (see above note.)
b) Press the blue button
→ to enter the “Lrn” menu. The display indicates
“LrnX” where “X” (0, 1 or 2) is the number of stored false target echoes.
c) To exit to the menu at this stage, press the red button
↵ and then the
green button
↓ to get to the next menu option.
d) To store a new false echo, hold the blue button down
→ for five seconds.
e) The display alternately flashes “Lrn” and the false target position. After
four seconds, the false target position is stored and the display
re-indicates “LrnX”.
f) Press the red button
↵ to save this false echo and exit to the menu.
However, if this false echo shouldn't be saved, press the blue button
→ to
exit to the menu.
g) To store another false target echo, re-start from step (b).
h) Press the green button
↓ to exit the menu and return to the PV display.
NOTE:
If there are two false echoes stored (“Lrn2”), the transmitter will not allow
another echo to be stored until the memory is cleared (see next procedure.)