Operation Troubleshooting - Siemens SITRANS LR250 Operating Instructions Manual

Diagnosing and troubleshooting

10.4 Operation troubleshooting

10.4 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:
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•
•
•
Reading does not SITRANS LR250 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
too much load resistance
182
poor installation
flange not level
Auto False Echo Suppression
may be incorrectly applied
temperature too high
physical damage
excessive foam
multiple echoes
setting for Low Calibration Pt.
(2.3.1.) not correct
setting for Sensor Offset
(2.3.3.) not correct
Action
check specifications
•
check Low Calibration Pt. (2.3.1.)
•
increase Confidence (2.8.6.1.)
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clean the antenna
•
re-locate SITRANS LR250
•
check to ensure nozzle is vertical
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ensure end of antenna protrudes from end of nozzle
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review Auto False Echo Suppression (Page 244).
•
ensure Auto False Echo Suppression Range is set correct-
•
ly
check Current Internal Temperature (3.2.1.)
•
use foam deflector or stillpipe
•
relocate
•
use a defoamer
•
set Algorithm (2.8.4.1.) to F (First echo)
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re-locate SITRANS LR250
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check nozzle for internal burrs or welds
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rotate device 90°
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use Auto False Echo Suppression (2.8.7.1.)
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if necessary: see Auto False Echo Suppression
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(Page 244).
check distance from sensor reference point to Low Cali-
•
bration Pt. (2.3.1.)
check Sensor Offset (2.3.3.)
•
check nameplate rating against voltage supply
•
check power wiring or source
•
change barrier type, or
•
remove something from the loop, or
•
increase supply voltage
•
reduce wire distance or use larger gage wire
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Operating Instructions, 12/2015, A5E32220602-AD
SITRANS LR250 (mA/HART)