Operation Troubleshooting - Siemens SITRANS LR560 Operating Instructions Manual

Diagnosing and troubleshooting

10.3 Operation troubleshooting

10.3 Operation troubleshooting
Operating symptoms, probable causes, and resolutions.
Symptom Cause
Display shows level or target is out of range
Display shows material build-up on antenna
Display shows location or aiming:
•
•
•
Display shows antenna malfunction:
•
•
Reading does not SITRANS LR560 processing
change, but the level wrong echo, for example, vessel
does wall, or structural member
Measurement is con-
•
sistently off by a con-
stant amount
•
Screen blank power error
Reading erratic echo confidence weak
material filling
Reading response FILL RATE/MIN (2.4.2.)
slow (Page 115) setting incorrect
160
poor installation
flange not level
Auto False Echo Suppression
may be incorrectly applied
temperature too high
physical damage
setting for LOW
CALIBRATION POINT
(2.3.1.) (Page 113) not cor-
rect
setting for SENSOR OFFSET
(2.3.3.) (Page 114) not cor-
rect
Action
check specifications
•
check LOW CALIBRATION POINT (2.3.1.) (Page 113).
•
increase CONFIDENCE (2.7.6.1) (Page 126).
•
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 Echo processing (Page 180)
•
ensure Auto False Echo Suppression Range is set correct-
•
ly
check temperature in MAXIMUM MEASURED VALUE
•
(3.4.2.) (Page 131).
relocate
•
re-locate SITRANS LR560
•
check nozzle for internal burrs or welds
•
rotate device 90°
•
use AUTO FALSE ECHO SUPPRESSION (2.8.1)
•
(Page 126) if necessary.
check distance from sensor reference point to LOW
•
CALIBRATION POINT (2.3.1.) (Page 113)
check SENSOR OFFSET (2.3.3.) (Page 114)
•
check nameplate rating against voltage supply
•
check power wiring or source
•
refer to CONFIDENCE (2.7.6.1) (Page 126).
•
use AUTO FALSE ECHO SUPPRESSION (2.8.1)
•
(Page 126) and AUTO FALSE ECHO SUPPRESSION
RANGE (2.8.2) (Page 127)
use foam deflector or stillpipe
•
Re-locate SITRANS LR560.
•
increase measurement response if possible
•
Operating Instructions, 06/2017, A5E34647946-AD
SITRANS LR560 (mA/HART)