SITRANS LR200 with mA/HART
144
Operating Instructions, 05/2019, A5E32337676-AE
9.4
Operation troubleshooting
Operating symptoms, probable causes, and resolutions.
Symptom
Cause
Action
Display shows
level or target is out of range
•
check specifications
•
check Low calibration point (2.3.1.) (Page 100)
•
increase Confidence (2.8.6.1.) (Page 114)
Display shows
material build-up on antenna
•
clean the antenna
•
relocate SITRANS LR200
Display shows
location or aiming:
•
poor installation
•
flange not level
•
Auto False Echo Suppression
may be incorrectly applied
•
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
Display shows
antenna malfunction:
•
temperature too high
•
physical damage
•
excessive foam
•
multiple echoes
•
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)
Reading does not
change, but the level
does
SITRANS LR200 processing
wrong echo, for example, vessel
wall, or structural member
•
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)
Measurement is con-
sistently off by a con-
stant amount
•
setting for Low calibration
point (2.3.1.) (Page 100) not
correct
•
setting for Sensor offset
rect
•
check distance from sensor reference point to Low calibra-
tion point (2.3.1.) (Page 100)
•
check Sensor offset (2.3.3.) (Page 101)
Screen blank
power error
•
check nameplate rating against voltage supply
•
check power wiring or source
too much load resistance
•
change barrier type, or
•
remove something from the loop, or
•
increase supply voltage
•
reduce wire distance or use larger gage wire
Reading erratic
echo confidence weak
•
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
