Siemens Sitrans LR200 Instruction Manual page 128

Symptom
Reading erratic
Reading response slow
Reads correctly but occa-
sionally reads high when
vessel is not full
Level reading lower than
actual material level
Page 120 SITRANS LR200 (HART) – INSTRUCTION MANUAL
Operation Troubleshooting (cont' d )
Cause
echo confidence weak
liquid surface vortexed
material filling
Fill Rate (2.4.2.) setting incor-
rect
• 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
• refer to Confidence (2.8.6.1.)
• use Auto False Echo Suppression (2.8.7.1.)
and Auto False Echo Suppression Range
(2.8.7.2.)
• use foam deflector or stillpipe
• decrease Fill Rate (2.4.2.)
• relocate instrument to side pipe
• increase confidence threshold in Echo
Threshold (2.8.4.3.)
• re-locate SITRANS LR200
• increase measurement response if possi-
ble
• clean the antenna
• use Auto False Echo Suppression (2.8.7.1.)
and Auto False Echo Suppression Range
(2.8.7.2.)
• decrease Near Range (2.8.1.) (minimum
value depends on antenna type)
• raise SITRANS LR200
• ensure Algorithm (2.8.4.1.) is set to F (First
echo)
• ensure Material (2.2.3.) selection is LIQ-
UID LOW DK
• set Position Detect (2.8.4.2.) to Hybrid
• set CLEF Range (2.8.4.4.) to 0.5 m
7ML19985JP02