Siemens SITRANS L Operating Instructions Manual page 148

Diagnosing and troubleshooting
9.4 Operation troubleshooting
Symptom
Reading response slow Fill rate/min (2.3.8.2.) (Page 97)
Reads correctly but
occasionally reads high
when vessel is not full
Level reading lower
than actual material
level
148
Cause
liquid surface vortexed
material filling
setting 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
• decrease Fill rate/min (2.3.8.2.) (Page 97)
• relocate device to side pipe
• increase confidence threshold in Echo threshold (2.5.7.3.)
(Page 105)
• relocate SITRANS LR200
• increase measurement response if possible
• clean the antenna
• use Auto false echo suppression (2.5.10.1.) (Page 107) and
Auto false echo suppression range (2.5.10.2.) (Page 109)
• decrease Near range (2.5.1.) (Page 102) (minimum value
depends on antenna type)
• raise SITRANS LR200
• ensure Algorithm (2.5.7.1.) (Page 104) is set to F (First
echo)
• ensure Material (1.2.) selection is LIQUID LOW DK
• set Position detect (2.5.7.2.) (Page 104) to Hybrid
• set CLEF range (2.5.7.4.) (Page 105) to 0.5 m
Operating Instructions, 07/2021, A5E32337680-AF
SITRANS LR200 with PROFIBUS PA