Operation Troubleshooting - Siemens SITRANS LR260 Operating Instructions Manual

Operation Troubleshooting

Operating symptoms, probable causes, and resolutions.
Symptom
Display shows
S: 0 LOE
Display shows
S: 0 LOE
Display shows
S: 0 LOE
Display shows
S: 0 LOE
Reading does not
change, but the level
does
Measurement is con-
sistently off by a con-
stant amount
Screen blank
A5E32337685 SITRANS LR260 (PROFIBUS PA) – OPERATING INSTRUCTIONS
Cause
level or target is out of
range
material build-up on
antenna
location or aiming:
• poor installation
• flange not level
antenna malfunction:
• temperature too high
• physical damage
SITRANS LR260 process-
ing wrong echo, i.e. vessel
wall, or structural member
• setting for Low
Calibration Pt. (LOW
CALIB. PT.) (2.2.1.3.) not
correct
• setting for Sensor Offset
(2.2.1.10.) not correct
power error
Action
• check specifications
• check Low Calibration Point (LOW
CALIB. PT.) (1.5.)
• increase Echo Confidence (2.2.3.6.1.)
• clean the antenna
• re-locate SITRANS LR260
• check to ensure nozzle is vertical
• use Auto False Echo Suppression
(AUTO ECHO SUPP) (2.2.4.3.) and
check Auto Suppression Range
(AUTO SUPP RANGE) (2.2.4.4.) to
ensure nozzle protrudes from end of
vessel nozzle.
• check Maximum Internal
Temperature (MAX. INTERN. TEMP)
(3.3.8.)
• set Algorithm (2.2.3. 1 .1.) to tF
(trueFirst echo)
• relocate
• re-locate SITRANS LR260
• ensure nozzle protrudes 10 mm min.
• rotate instrument 90°
• use Auto False Echo Suppression
(AUTO ECHO SUPP) (2.2.4.3.) and
Auto Suppression Range (AUTO
SUPP RANGE) (2.2.4.4.)
• check distance from sensor
reference point to Low Calibration
Pt. (LOW CALIB. PT.) (2.2.1.3.)
• check Sensor Offset (2.2.1. 1 0.)
• check nameplate rating against
voltage supply
• check power wiring or source
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