Siemens 7ML5431 - Page 173

Diagnosing and troubleshooting
10.4 Operation troubleshooting
SITRANS LR250 with mA/HART
Operating Instructions, 10/2019, A5E32220602-AG
173
Symptom
Cause
Action
liquid surface vortexed
• decrease
Fill Rate per Minute (2.4.2.)
• relocate device to side pipe
• increase confidence threshold in
Echo Threshold (2.8.4.3.)
material filling
• Re-locate SITRANS LR250
Reading response
slow
Fill Rate per Minute (2.4.2.)
set-
ting incorrect
• increase measurement response if possible
Reads correctly but
occasionally reads
high when vessel is
not full
• detecting close range echo
• build up near top of vessel or
nozzle
• nozzle problem
• clean the antenna
• use
Auto False Echo Suppression (2.8.7.1.)
and
Auto
False Echo Suppression Range (2.8.7.2.)
Level reading lower
than actual material
level
• material is within Near Range
zone
• multiple echoes processed
• decrease
Near Range (2.8.1.)
(minimum value depends
on antenna type)
• raise SITRANS LR250
• ensure
Algorithm (2.8.4.1.)
is set to F (First echo)
• vessel near empty and low
dK material
• ensure
Material (2.2.3.)
selection is LIQUID LOW DK
• set
Position Detect (2.8.4.2.)
to Hybrid
• set
CLEF Range (2.8.4.4.)
to 0.5 m