Siemens SITRANS LR 300 Instruction Manual Page 95

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7ML19985CL02 SITRANS LR 300 – INSTRUCTION MANUAL Page 93
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Troubleshooting
Maintenance
The SITRANS LR 300 requires no maintenance or cleaning under normal operating
conditions.
Reading erratic echo confidence weak
refer to P805
use P837
use foam deflector or stilling
well
liquid surface vortexed
decrease measurement
response P003
relocate unit to side pipe
increase confidence threshold
P804
material filling
re-locate SITRANS LR 300
Reading
response slow
P003 setting
increase response if possible
Reads correctly
but occasionally
reads high
when vessel is
not full
detecting close range echo
build up near top of tank or
nozzle
water or other high ε
r
material in antenna threads
wrong antenna choice for
application
nozzle problem
•clean
rod extensions may be
required
See Application Example:
Stillpipe or By-pass Pipe on
page 53
use P837/P838
upgrade to shielded rod
antenna
Level reading
lower than
material level
material is within near
blanking zone
tank near empty and low ε
r
material
multiple echoes processed
decrease blanking P800 (min.
0.4 m)
raise SITRANS LR 300
decrease range extension
set P820 to 12 (First echo)
nozzle too narrow for length See Rod Extension
Requirements on page 28
Upgrade to Shielded Rod
Antenna
Internal seam in nozzle Inspect and remove seam
Use P837
upgrade to shielded rod
antenna
Symptom Cause Action
Note: Under severe operating conditions, the antenna may require periodic cleaning.
SITRANS LR 300.book Page 93 Monday, June 10, 2002 7:18 PM
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