Siemens SITRANS LUT430 - Troubleshooting Fixed Readings and Obstructions

Page 238 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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Troubleshooting
Symptom Cause Action
Reading is fixed, but
material level changes
or reading does not fol-
low material level
Incorrect speed of response Verify response speed setting is
adequate for process. See
Response Rate (set in the Quick
Start Wizard).
Loss of Echo condition (LOE) Check Noise, Echo Strength, Con-
fidence. See Echo Quality (3.2.9.)
on page 204.
Check LOE Timer is not set too
short. See LOE Timer (2.4.2.) on
page 144.
Agitator blade stopped in front
of transducer (false echo)
Ensure agitator is running.
Foam on surface of material Eliminate source of foaming.
Use stilling well
Incorrect Algorithm used Set algorithm to default. If no
improvement, try a different algo-
rithm. See Algorithm (2.12.2.1.) on
page 182.
Transducer mounting: wrong
location or incorrectly mounted
Ensure beam has a clear path to
material surface;
Verify transducer is not too tight;
Use an isolation coupling.
Incorrect transducer used for
the application
Use correct transducer. Contact
your Siemens representative.
Unavoidable false echoes from
obstructions
Relocate transducer to ensure
beam has a clear path to material
surface;
Use manual TVT shaping or Auto
False Echo Suppression. See TVT
Shaper (2.12.4.) on page 185 or
Auto False Echo Suppression
(2.12.3.1.) on page 184.