Siemens SITRANS LR 300 Manuel d'instructions Page 94

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Page 92 SITRANS LR 300 – INSTRUCTION MANUAL 7ML19985CL02
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Troubleshooting
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
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