Siemens SITRANS LR 300, Instruction Manual, Page: 94 / 140

Page 92 SITRANS LR 300 – INSTRUCTION MANUAL 7ML19985CL02
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Tr
oubleshoot
ing
Operation Troubleshooting
Operating symptoms, probable causes, and resolutions.
Symptom Cause Action
display reads level or target is out of range
• check specifications
• check P006
• increase range extension
P805
display reads material build-up on antenna
• clean
• upgrade to purged antenna
• re-locate SITRANS LR 300
display reads location or aiming:
• poor installation
• flange not level
• check to ensure nozzle is
vertical
• use P837
• check to ensure nozzle is
clean and free of internal
seams/welds
display reads antenna malfunction:
• temperature too high
• physical damage
• excessive foam
• multiple echoes
• check P343
• use foam deflector or stilling
well
• relocate
• use a defoamer
• set P820 to 12 (First echo)
Reading does
not change, but
the level does SITRANS LR 300 processing
wrong echo, i.e. vessel wall, or
structural member
• re-locate SITRANS LR 300
• check nozzle for internal burrs
or welds
• rotate unit 90
o
• use P837
Measurement is
consistently off
by a constant
amount P006 not correct
P652 not correct
• Check distance from Flange
face to zero level (P006)
• Check offset value (P652) or
device tag
Screen blank power error
• check nameplate rating
against voltage supply
• check power wiring or source
SITRANS LR 300.book Page 92 Monday, June 10, 2002 7:18 PM