Maintenance - Siemens SITRANS LR 300 Instruction Manual

Symptom
Reading erratic
Reading
response slow
Reads correctly
but occasionally
reads high
when vessel is
not full
Level reading
lower than
material level

Maintenance

The SITRANS LR 300 requires no maintenance or cleaning under normal operating
conditions.
Note:
Under severe operating conditions, the antenna may require periodic cleaning.
7ML19985CL02
Cause
echo confidence weak
liquid surface vortexed
material filling
P003 setting
• detecting close range echo
• build up near top of tank or
nozzle
• water or other high
material in antenna threads
• wrong antenna choice for
application
• nozzle problem
• material is within near
blanking zone
• tank near empty and low
material
• multiple echoes processed
• nozzle too narrow for length
• Internal seam in nozzle
SITRANS LR 300 – INSTRUCTION MANUAL
• refer to P805
• use P837
• use foam deflector or stilling
well
• decrease measurement
response P003
• relocate unit to side pipe
• increase confidence threshold
P804
• re-locate SITRANS LR 300
• increase response if possible
• clean
• rod extensions may be
required
• See Application Example:
r
Stillpipe or By-pass Pipe on
page 53
• use P837/P838
• upgrade to shielded rod
antenna
• decrease blanking P800 (min.
0.4 m)
• raise SITRANS LR 300
r
• decrease range extension
• set P820 to 12 (First echo)
• See Rod Extension
Requirements on page 28
• Upgrade to Shielded Rod
Antenna
• Inspect and remove seam
• Use P837
• upgrade to shielded rod
antenna
Action
Page 93