Operation Troubleshooting - Siemens SITRANS LR560 Operating Instructions Manual

10.3

Operation troubleshooting

Operating symptoms, probable causes, and resolutions.
Symptom
Display shows
Display shows
Display shows
Display shows
Reading does not
change, but the level
does
Measurement is con-
sistently off by a con-
stant amount
Screen blank
Reading erratic
Reading response
slow
LR560 (FOUNDATION FIELDBUS)
Operating Instructions, 06/2018, A5E34648692-AE
Cause
level or target is out of range
material build-up on antenna
location or aiming:
poor installation
•
flange not level
•
Auto False Echo Suppression
•
may be incorrectly applied
antenna malfunction:
temperature too high
•
physical damage
•
SITRANS LR560 processing
wrong echo, for example, vessel
wall, or structural member
setting for LOW
•
CALIBRATION POINT
(2.3.5.1.) (Page 123) not cor-
rect
setting for SENSOR OFFSET
•
(2.3.5.3.) (Page 124) not cor-
rect
power error
echo confidence weak
material filling
FILL RATE/MIN (2.3.6.2.)
(Page 126) setting incorrect
Action
check specifications
•
check LOW CALIBRATION POINT (2.3.5.1.) (Page 123).
•
increase CONFIDENCE (2.4.7.1.) (Page 132).
•
Use the air purge feature to clean the antenna
•
re-locate SITRANS LR560.
•
check to ensure nozzle is vertical
•
ensure end of antenna protrudes from end of nozzle
•
review MAXIMUM MEASURED VALUE (3.5.2.)
•
(Page 144)
ensure Auto False Echo Suppression Range is set correct-
•
ly
check temperature in MAXIMUM VALUE (3.4.2.)
•
(Page 144).
relocate
•
re-locate SITRANS LR560
•
check nozzle for internal burrs or welds
•
rotate device 90°
•
use AUTO ECHO SUPPRESSION (2.4.8.1.) (Page 132) if
•
necessary.
check distance from sensor reference point to LOW
•
CALIBRATION POINT (2.3.5.1.) (Page 123)
check SENSOR OFFSET (2.3.5.3.) (Page 124)
•
check nameplate rating against voltage supply
•
check power wiring or source
•
refer to CONFIDENCE (2.4.7.1.) (Page 132).
•
use AUTO ECHO SUPPRESSION (2.4.8.1.) (Page 132)
•
and AUTO SUPPRESSION RANGE (2.4.8.2.) (Page 134)
use foam deflector or stillpipe
•
Re-locate SITRANS LR560.
•
increase measurement response if possible
•
Diagnosing and troubleshooting
10.3 Operation troubleshooting
169