Siemens HydroRanger 200 HMI Operating Instructions Manual page 231

Symptom
Reading is fixed, but
material level changes
or reading does not fol-
low material level
A5E36281317
Cause
Incorrect speed of response
Loss of Echo condition (LOE)
Agitator blade stopped in front
of transducer (false echo)
Foam on surface of material
Incorrect Algorithm used
Transducer mounting: wrong
location or incorrectly mounted
Incorrect transducer used for
the application
Unavoidable false echoes from
obstructions
HydroRanger 200 HMI – OPERATING INSTRUCTIONS
Action
Verify response speed setting is
adequate for process (set in Quick
Response Rate
Start Wizard, see
on page 36).
Check Noise, Echo Strength, Con-
3.2.9. Echo Quality
fidence. See
page 192.
Ensure that LOE Timer is not set
2.4.2. LOE Timer
too short. See
page 127.
Ensure agitator is running.
Eliminate source of foaming.
Use stilling well
Set algorithm to default. If no
improvement, try a different algo-
2.11.2.2. Algorithm
rithm. See
page 160.
Ensure beam has a clear path to
material surface;
Verify transducer is not too tight;
Use an isolation coupling.
Use correct transducer. Contact
your Siemens representative.
Relocate transducer to ensure
beam has a clear path to material
surface; use manual TVT shaping
or Auto False Echo Suppression.
2.11.4. TVT Shaper
See
2. 1 1.3.2. Auto False Echo Sup-
or
pression
on page 164.
on
on
on
on page 167
Page 221