Siemens SITRANS LUT400, Operating Instructions Manual

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A5E33329501 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS Page 237
m
mmmm
Tr
oub
leshoot
in
g
Symptom Cause Action
Reading fluctuates
while material level is
still Material level is changing Visually verify, if possible.
Strong false echoes Determine source of false echoes;
Relocate transducer to avoid
source.
Incorrect damping Adjust damping. See Damping Fil-
ter (2.3.3.) on page 143.
Improper echo Algorithm selec-
tion Set algorithm to default. If no
improvement, try a different algo-
rithm. See Algorithm (2.12.2.1.) on
page 182.
High noise levels Verify source and minimize. See
“Noise Problems” on page 242.
Weak echo Determine cause;
Check noise, confidence, FOM,
and echo strength. See Echo
Quality (3.2.9.) on page 204.
Foam on surface of material Eliminate source of foaming;
Use stilling well.
Rapid temperature changes Use an external temperature sen-
sor. See Temperature Source
(2.12.1.3.) on page 181.
Faulty temperature sensor Verify operation;
Replace if required, or use fixed
temperature. See Temperature
Source (2.12.1.3.) on page 181.
Vapours If fluctuation is unacceptable, con-
sider an alternative technology.
Contact your Siemens representa-
tive.