Siemens HydroRanger 200 HMI Operating Instructions Manual page 232

Symptom
Accuracy varies
Reading erratic
Page 222 HydroRanger 200 HMI – OPERATING INSTRUCTIONS
Cause
Faulty temperature sensor
Vapors present in varying con-
centrations
Thermal gradients
Calibration required
Transducer mounting: wrong
location or incorrectly mounted
Unavoidable false echoes from
obstructions
Confidence too low
Multiple echoes
Noise in the application
Action
Verify operation; replace if
required, or use fixed tempera-
2.11. 1 .4. Temperature
ture. See
Source
on page 157.
Eliminate vapors or consider a dif-
ferent technology. Contact your
Siemens representative.
Insulate vessel; consider external
temperature sensor.
If accuracy is better when level is
close to transducer, and worse
when level is far from it, perform
2.11. 1 .8. Auto
calibration [see
Sound Velocity
on page 159].
If accuracy is consistently incor-
2.2.5. Sensor Offset
rect, use
page 123 or perform calibration.
Ensure beam has a clear path to
material surface.
Verify transducer is not too tight.
Use an isolation coupling.
Use Auto False Echo Suppression.
2. 1 1.3.2. Auto False Echo Sup-
See
pression
on page 164.
Check Noise, Echo Strength, Con-
3.2.9. Echo Quality
fidence. See
page 192.
Check LOE Timer is not set too
2.4.2. LOE Timer
short. See
page 127.
Check mounting location;
verify material is not entering
Blanking range zone. See
Blanking
on page 123.
Verify source and minimize. See
Noise problems
on page 226.
on
on
on
2.2.6.
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