Siemens SITRANS LR560 Operating Instructions Manual page 119
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Also See for SITRANS LR560:
- Quick start manual (270 pages) ,
- Operating instructions manual (222 pages) ,
- Compact operating instructions (66 pages)
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Symptom
Display shows
S: 0 LOE
Reading does not
change, but the level
does
Measurement is
consistently off by a
constant amount
Screen blank
Reading erratic
Reading response
slow
Reads correctly but
occasionally reads
high when vessel is
not full
Level reading lower
than material level
7ML19985LT01
SITRANS LR560 (PROFIBUS PA) – OPERATING INSTRUCTIONS
Operation Troubleshooting (cont'd)
Cause
antenna malfunction:
• temperature too high
• physical damage
SITRANS LR560 processing
wrong echo, i.e. vessel
wall, or structural member
• setting for Low Calibra-
tion Pt. not correct
• setting for Sensor Offset
not correct
power error
echo confidence weak
material filling
Fill Rate/Min (2.3.6.2.)
setting is incorrect
• detecting close range
echo
• build up near top of ves-
sel or nozzle
• nozzle problem
• material is within Near
Range zone
• multiple echoes pro-
cessed
Action
• check temperature in Maximum
Value (3.4.2.)
• relocate
• re-locate SITRANS LR560
• check nozzle for internal burrs or
welds
• rotate instrument 90°
• use Auto False Echo Suppression
(2.4.8.1.) if necessary: see
Echo Suppression (2.4.8. 1 .)
118
• check distance from sensor refer-
ence point to Low Calibration Pt.
(2.3.5.1.)
• check Sensor Offset (2.3.5.3.)
• check nameplate rating against volt-
age supply
• check power wiring or source
• refer to Confidence (2.4.7.1.)
• useAuto False Echo Suppression
(2.4.8.1.) and Auto False Echo Sup-
pression Range (2.4.8.2.)
• re-locate SITRANS LR560
• increase measurement response if
possible
• Use the air purge feature to clean the
antenna
• use Auto False Echo Suppression
(2.4.8.1.) and Auto False Echo Sup-
pression Range (2.4.8.2.)
• decrease Near Range (2.4.1.): mini-
mum value depends on antenna type
• raise SITRANS LR560
• ensure Algorithm (2.4.5. 1 .) is set to tF
(trueFirst echo)
Auto False
on page
Page 113
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Table of Contents
Troubleshooting
