Operation Troubleshooting; Auto False Echo Suppression (2.2.5.6.); Auto Suppression Range (2.2.5.7.) - Siemens Sitrans LR250 Instruction 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
7ML19985JE01
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
SITRANS LR250 process-
ing wrong echo, i.e. vessel
wall, or structural member
2.2.1.6. Low
• setting for
Calibration Pt.
not
correct
2.2. 1 .19. Sensor
• setting for
Offset
not correct
power error
too much load resistance
SITRANS LR250 (HART) – INSTRUCTION MANUAL
Action
• check specifications
2.2.1.6. Low Calibration Pt.
• check
2.2.4.5. 1 . Confidence
• increase
• clean the antenna
• re-locate SITRANS LR250
• check to ensure nozzle is vertical
2.2.5.6. Auto False Echo
• use
Suppression
and check
Suppression Range
protrudes from end of nozzle.
3. 1 4. 1 . Current Internal
• check
Temperature
• use foam deflector or stillpipe
• relocate
• use a defoamer
2.2.4.1.1. Algorithm
• set
echo)
• re-locate SITRANS LR250
• check nozzle for internal burrs or
welds
• rotate instrument 90°
2.2.5.6. Auto False Echo
• use
Suppression 2.2.5.7. Auto
and
Suppression Range
• check distance from sensor
2.2.1.6. Low
reference point to
Calibration Pt.
2.2.1.19. Sensor Offset
• check
• check nameplate rating against
voltage supply
• check power wiring or source
• change barrier type, or
• remove something from the loop, or
• increase supply voltage
2.2.5.7. Auto
to ensure nozzle
to F (First
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