Limaco ULM-3D Series, Operating And Installation Manual

Page: 39 / 56

7. TROUBLESHOOTING
The personnel responsible for the operation of level transmitter shall take steps to
correct any arising problems. Do not use a faulty level transmitter.
The sources of the failure of level transmitter-based measuring system can include:
- level transmitter itself;
- receiving device that displays information;
- level transmitter power supply;
- process in the tank.
In case of failure, the source of fault shall be localized to the maximum extent poss-
ible.
When using analog signal, check that the output signal is present and correctly gen-
erated directly at the level transmitter output, pay attention to the presence of 3 mA,
4 mA or 21 mA alarms, and check the power supply voltage.
You can get the most extensive opportunities to find and fix measurement problems
using a PC and Configurator software.
In most cases, this can help you determine the cause of failures and fix the mea-
surement problem.
You can also diagnose the device using the Bluetooth channel.
Checking and Troubleshooting operations for the level transmitter are summarized
in the table below.
Failure Cause Troubleshooting method
No 4-20mA
signal The supply voltage is absent
or outside the acceptable
values (see cl. 12.1 of
Technical specifications) Check the power supply, the elec-
trical connection, and eliminate the
non-compliance, if any.
The electrical connection of
the 4-20mA output is dam-
aged or the line resistance is
too high (see cl. 12.1 of
Technical specifications) Restore the connection or eliminate
the increased load in the line.
Malfunction of the level
transmitter electronic unit. Send the device for repair.
NOTE
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RE_ULM3DX_18_02_20