Operation Troubleshooting - Siemens SITRANS LR200 7ML5422 Operating Instructions Manual

9.4

Operation troubleshooting

Operating symptoms, probable causes, and resolutions.
Symptom
Display shows
Display shows
Display shows
Display shows
Reading does not
change, but the level
does
Measurement is con-
sistently off by a con-
stant amount
Screen blank
Reading erratic
144
Cause
level or target is out of range
material build-up on antenna
location or aiming:
poor installation
•
flange not level
•
Auto False Echo Suppression
•
may be incorrectly applied
antenna malfunction:
temperature too high
•
physical damage
•
excessive foam
•
multiple echoes
•
SITRANS LR200 processing
wrong echo, for example, vessel
wall, or structural member
setting for Low calibration
•
point (2.3.1.) (Page 100) not
correct
setting for Sensor offset
•
(2.3.3.) (Page 101) not cor-
rect
power error
too much load resistance
echo confidence weak
Action
check specifications
•
check Low calibration point (2.3.1.) (Page 100)
•
increase Confidence (2.8.6.1.) (Page 114)
•
clean the antenna
•
relocate SITRANS LR200
•
check to ensure nozzle is vertical
•
ensure end of antenna protrudes from end of nozzle
•
review Auto false echo suppression (2.8.7.1.) (Page 115).
•
ensure Auto False Echo Suppression Range is set correct-
•
ly
check Current internal temperature (3.2.1.) (Page 120)
•
use foam deflector or stillpipe
•
relocate
•
use a defoamer
•
set Algorithm (2.8.4.1.) (Page 111) to F (First echo)
•
re-locate SITRANS LR200
•
check nozzle for internal burrs or welds
•
rotate device 90°
•
use Auto false echo suppression (2.8.7.1.) (Page 115)
•
check distance from sensor reference point to Low calibra-
•
tion point (2.3.1.) (Page 100)
check Sensor offset (2.3.3.) (Page 101)
•
check nameplate rating against voltage supply
•
check power wiring or source
•
change barrier type, or
•
remove something from the loop, or
•
increase supply voltage
•
reduce wire distance or use larger gage wire
•
refer to Confidence (2.8.6.1.) (Page 114)
•
use Auto false echo suppression (2.8.7.1.) (Page 115) and
•
Auto false echo suppression range (2.8.7.2.) (Page 117)
use foam deflector or stillpipe
•
Operating Instructions, 05/2019, A5E32337676-AE
SITRANS LR200 with mA/HART