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58
Reference Manual
00809-0100-4840, Rev CB
Section 5: Service and Troubleshooting
February 2015
5.2
Servicing
The only maintenance required is to occasionally check the transmitter face to ensure it remains
clean and check that the cover seal, wiring, and cable glands are in good condition.
There are no spare parts for the Rosemount 3101, 3102, and 3105. If a problem persists,
contact Rosemount Inc. for advice.
5.3
Diagnostics for the 3101
5.3.1
General troubleshooting
No display
Check the power supply. Ensure there is a minimum of 12 Vdc at the instrument terminals.
Check that the cable insulation is not preventing contact at the terminal block.
No level reading
Check that the instrument is ticking about once per second. If there is no ticking, the instrument
should be replaced.
5.3.2
Error messages
Flashing “LE” with “0000”
The transmitter is not receiving a return echo, which could mean the liquid surface is poor or
that it is beyond the range of 26 ft (8 m) of the instrument. Change the position of the
transmitter or contact Emerson Process Management for information on longer range
instruments
This means that the transmitter is not receiving a return echo, possibly because the liquid
surface is poor or beyond the range (8m/26ft) of the instrument. Re-locate the instrument or
contact Rosemount Inc. for details of longer range instruments.
Flashing “LE” with level reading
This means that the transmitter is no longer receiving satisfactory echoes from the liquid
surface. This may be because of one of a variety of reasons, for example, excessive foaming,
turbulence, or ullage vapors.
First, check that the transmitter face is free from contamination and condensation. The
transmitter will operate with some condensation on the face, but excessive condensation may
cause operational problems. If the vessel cannot be adequately vented to prevent condensation
forming, contact Rosemount Inc. for alternative solutions.
Second, check that the instrument is still vertically aligned above the liquid surface and check
the echo received size. If the echo size is small (<3), re-position the transmitter or modify the
vessel for the transmitter to operate above a more acceptable area of the liquid surface.
Lost echo (LE) is signalled when there has been no return echo for 10 seconds. Within the 10
seconds, the output will remain fixed. If, after the 10 seconds, no satisfactory has been received,
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