Operation Troubleshooting - Siemens sitrans LR200 Instruction Manual

Operation Troubleshooting

Operating symptoms, probable causes, and resolutions.
Symptom
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
Page 100 SITRANS LR200 (PROFIBUS PA)– INSTRUCTION MANUAL
Operation Troubleshooting
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
• excessive foam
• multiple echoes
The wrong echo is being
processed, for example,
vessel wall or structural
member.
• setting for Low
Calibration Pt. (2.2. 1 .4.)
not correct
• setting for Sensor Offset
(2.2.1.10.) not correct
power error
Action
• check specifications
• check Low Calibration Point (1.5.)
• clean the antenna
• re-locate SITRANS LR200
• check to ensure nozzle is vertical
• use Auto False Echo Suppression
(2.2.4.2.) and check Auto
Suppression Range (2.2.4.3.) to
ensure end of shield section of rod
protrudes from end of nozzle.
• check Max. Internal Temperature
(3.3.8.)
• use foam deflector or stillpipe
• relocate the device
• use a defoamer
• set Algorithm (2.2.3.1.1.) to tF
(trueFirst echo)
• re-locate the device
• check nozzle for internal burrs or
welds
• rotate instrument 90°
• use Auto False Echo Suppression
(2.2.4.2.) and Auto Suppression
Range (2.2.4.3.)
• check distance from sensor
reference point to Low Calibration
Pt. (2.2.1.4.)
• check Sensor Offset (2.2.1.10.)
• check nameplate rating against
voltage supply
• check power wiring or source
7ML19985JR01