Service And Troubleshooting Tools - Emerson Rosemount 5408 Reference Manual

Reference Manual
00809-0300-4408
Table 7-12: Troubleshooting the F
Symptom
Transmitter does not stay on segment
7.5

Service and troubleshooting tools

This section briefly describes tools and functions in the Rosemount Radar Master Plus,
AMS Device Manager, and handheld communicator, which may be useful for service and
troubleshooting of the Rosemount 5408 Level Transmitter.
7.5.1 Using the echo curve
The Rosemount Radar Master Plus software includes functions for viewing and recording
single instances or movies of the echo curve. The echo curve represents the tank, as seen
by the radar transmitter. Each peak corresponds to a strong reflection of the radar signal.
When connected to Rosemount Radar Master Plus, past measurement records and echo
curves including the 10 highest peaks, as well as the 50 last alert events are automatically
transferred from the transmitter's internal memory to the hard drive on your local
computer. Past measurement records are then available the next time you connect to the
transmitter using the level trend timeline.
Rosemount 5408 Level Transmitter
Fieldbus Output
OUNDATION
Possible causes
Incorrect signal levels
Excess noise on segment
Service and troubleshooting
(continued)
Recommended actions
• Check for two terminators. A
terminator should be installed at
the beginning and end of every
Fieldbus segment.
• Excess cable length.
• Check for bad power supply or
conditioner.
• Check for incorrect grounding.
• Check for correct shielded wire.
• Tighten all wiring and shield
connections on the effected part
of the segment.
• Check for corrosion or moisture on
terminals.
• Check for bad power supply.
• Check for electrically noisy
equipment attached to the
instrument ground.
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