User's Manual

Page 100 SITRANS LR260 (PROFIBUS PA) – OPERATING INSTRUCTIONS A5E32337685
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B: Troubleshooting
Reading erratic echo confidence weak • refer to Echo Confidence (2.2.3.6.1.)
•use Auto False Echo Suppression
(AUTO ECHO SUPP) (2.2.4.3.) and
Auto Suppression Range (AUTO
SUPP RANGE) (2.2.4.4.)
• use foam deflector
liquid surface vortexed • decrease Fill Rate (FILL RATE/MIN)
(2.2.6.2.)
• increase confidence threshold in
Echo Threshold (2.2.3.1.2.)
material filling • re-locate SITRANS LR260
Reading response
slow
Fill Rate (FILL RATE/MIN)
(2.2.6.2.) setting is 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
(AUTO ECHO SUPP) (2.2.4.3.) and
Auto Suppression Range (AUTO
SUPP RANGE) (2.2.4.4.)
Level reading lower
than material level
• material is within Near
Range zone
• multiple echoes
processed
• decrease Near Range (2.2.3.5.1.)
(minimum value depends on
antenna type)
• raise SITRANS LR260
•ensure Algorithm (2.2.3.1.1.) is set to
tF (trueFirst echo)
• vessel near empty and
low dK material
• set Position (2.2.3.1.3.) to Hybrid
Symptom Cause Action (cont’d)