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Reference Manual
00809-0100-4840, Rev CB
Section 5: Service and Troubleshooting
February 2015
5.5.8
Setting spike rejection (on the 3102/3105)
Screen display:
SPi
Default:
0 (disabled)
In applications with high levels of acoustic or electrical noise, a spike could incorrectly trigger
the echo detection system. The value of SPi can be increased (0 to 100) and has the effect of
rejecting spikes. Several different values may have to be tried to determine the best option.
Note
This menu option is in the engineering menu “Eng”. See
menu (on the 3102/3105)” on page 62
or see
for a map of the
menu structure
To change the spike rejection
1.
After entering the “Eng” menu (see the note above), press the green button
repeatedly until “SPi” is indicated.
2.
Press the blue button
to enter the spike rejection menu. The display indicates the
present SPi value
3.
If this SPi is correct, press the red button
and then press the green button
to get to
the next menu option. Otherwise, continue with step (
).
4.
Press the blue button
to start the editing mode. The SPi flashes to indicate it can be
edited.
5.
Press the green button
repeatedly to scroll through the options available (1 to 100).
6.
Press the blue button
to confirm the new setting. (The flashing stops).
7.
Press the red button
to save the new setting if it is correct, or press the blue button
to not save. Afterwards, depending on the button pressed, either the “SPi” menu or the
next menu appears.
5.5.9
Learn about echoes from false targets (on the 3102/3105)
Screen display:
Lrn
The Rosemount 3102 and Rosemount 3105 has an easy-to-use “Lrn” (Learn) routine that allows
the instrument to learn up to four 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
menu and return to the PV 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
This menu option is in the engineering menu “Eng”. See
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