Diagnosing and troubleshooting
10.4 Operation troubleshooting
SITRANS LR250 with mA/HART
172 Operating Instructions, 10/2019, A5E32220602-AG
10.4 Operation troubleshooting
Operating symptoms, probable causes, and resolutions.
Display shows
level or target is out of range
• check specifications
• check
Low Calibration Pt. (2.3.1.)
• increase
Display shows
material build-up on antenna
• clean the antenna
• re-locate SITRANS LR250
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 (Page 238
)
• 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.)
• use foam deflector or stillpipe
• relocate
• use a defoamer
• set
to
(First echo)
Reading does not
change, but the level
does
SITRANS LR250 processing
wrong echo, for example, vessel
wall, or structural member
• re-locate SITRANS LR250
• check nozzle for internal burrs or welds
• rotate device 90°
• use
Auto False Echo Suppression (2.8.7.1.)
• if necessary: see Auto False Echo Suppression
(Page 238).
Measurement is con-
sistently off by a con-
stant amount
• setting for
Low Calibration Pt.
(2.3.1.)
not correct
• setting for
not correct
• check distance from sensor reference point to
Low Cali-
bration Pt. (2.3.1.)
• check
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
• use
Auto False Echo Suppression (2.8.7.1.)
and
Auto
False Echo Suppression Range (2.8.7.2.)
• use foam deflector or stillpipe
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