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LMT S E R I E S |
M AG N E TOS T R I C T I V E L E V EL T R A N SM I T T ER | O I/L M T 10 0/ 2 0 0 - EN R E V. B
10 Maintenance
The LMT Series of level transmitters operate normally without
the need for periodic maintenance or inspection If the
transmitter meets or exceeds the requirements of the
application, the transmitter can be expected to provide reliable
level indication for a minimum of ten years
If the LMT Series of level transmitters is being used as part of a
Safety Implemented System (SIS), periodic testing is required
to proof the transmitter and detect any potential failure, which
is defined as Dangerous-Undetectable in normal operation
This testing must be performed at regular intervals (2 years),
and the results of this testing must be documented Should the
transmitter exhibit a fault during normal operation, it is
necessary to perform the proof testing, regardless of the
schedule As part of the testing documentation, all parameters
included in the menu structure of the transmitter, as well as the
configuration of the module jumpers, must be recorded As
devices, the LMT Series is used to provide a level measurement
to prevent overfill and dry run of a vessel
If a transmitter fails an inspection or assistance is required for
inspection or troubleshooting, contact the ABB Service
Department via email at ktek-service@us abb com The Service
Department will answer questions, provide additional
assistance and issue Return Authorization Numbers for
equipment in need of repair
CAUTION
In the event a magnetostrictive transmitter has suffered a
failure in any component which is exposed to the process,
any other magnetostrictive transmitter installed in the
same or similar process should be inspected for the same
failure, regardless of its maintenance schedule These
common cause failures include: 1) float collapse due to over
pressure; 2) damage due to material incompatibility; 3)
damage of the sensor tube due to improper installation
Personnel qualifications
Safety inspection, maintenance and troubleshooting should
only be performed by qualified personnel These qualifications
include knowledge of information in this instruction manual,
knowledge of the product and its operating principles,
knowledge of the application in which the transmitter is being
applied and general experience as an instrument technician
Before, during and after performing a safety inspection,
maintenance or troubleshooting, it is necessary to observe and
adhere to any safety standards, practices or requirements
defined in the end user policies
Required tools
The following tools may be required to perform inspection,
maintenance or troubleshooting for the LMT Series of level
transmitters
• Crescent wrench
• Screwdrivers
• Hex key wrenches
• Digital multi-meter
• Measuring tape
• Proprietary cable (purchased from ABB) for updating
electronic and sensor firmware (optional)
Electronic replacement
If the electronic module needs to be replaced proceed as
follows:
1
Disconnect the power supply and disconnect the wiring
DANGER - Serious damage to health /
risk to life
Explosion hazard Do not open or disconnect equipment
when a flammable or combustible atmosphere is present
2
Open the communication board compartment cover
Figure 38 Open Housing Cover
3
Remove the HMI display (if installed)
Figure 39 HMI Display
