Siemens sitrans LR200 Instruction Manual page 109

Symptom
Reading erratic
Reading response
slow
Reads correctly but
occasionally reads
high when vessel is
not full
Level reading lower
than material level
7ML19985JR01 SITRANS LR200 (PROFIBUS PA) – INSTRUCTION MANUAL
Operation Troubleshooting (cont' d )
Cause
echo confidence weak
liquid surface vortexed
material filling
Fill Rate (2.2.6.2.) setting is
incorrect
• detecting close range
echo
• build up near top of
vessel or nozzle
• nozzle problem
• material is within Near
Range zone
• multiple echoes
processed
• vessel near empty and
low dK material
Action (cont' d )
• use Auto False Echo Suppression
(2.2.4.2.) and Auto Suppression
Range (2.2.4.3.)
• use foam deflector or stillpipe
• decrease Fill Rate (2.2.6.2.)
• relocate instrument to side pipe
• increase confidence threshold in
Echo Threshold (2.2.3.1.2.)
• re-locate SITRANS LR200
• increase measurement response if
possible
• clean the antenna
• use Auto False Echo Suppression
(2.2.4.2.) and Auto Suppression
Range (2.2.4.3.)
• decrease Near Range (2.2.3.5.1.)
(minimum value depends on
antenna type)
• raise the device
• ensureAlgorithm (2.2.3.1.1.) is set to
tF (trueFirst echo)
• ensure Material (2.2.1.2.) selection is
LIQUID LOW DK
• set Position (2.2.3.1.3.) to Hybrid
• check the setting for CLEF
(Constrained Leading Edge Fit)
Range (2.2.3.4.1.): see the table
below Propagation Factor (2.2.1.1.)
for recommended settings
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