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Appendix B: Troubleshooting
WARNING: Explosion hazard. Do not connect or disconnect equipment unless
power has been switched off or the area is known to be non-hazardous.
System Issues
Symptom
LEVEL, % OUTPUT and
LOOP values are all
inaccurate
Level readings are
repeatable but consis-
tently high or low from
actual by a fixed
amount
Level, % Output and
Loop values fluctuate
Level, % Output and
Loop values all read-
ing low vs. actual
Level reading on Dis-
play is correct but
Loop is stuck on 4 mA
HART device only:
handheld will only
read universal com-
mands
7ML19985KA02
Problem
Basic configuration data is
questionable
Interface level has signifi-
cant emulsion.
Configuration data does not
accurately match probe
length or tank height.
Turbulence
High Frequency connection
Lower dielectric material
over higher dielectric mate-
rial, e.g. oil over water
Coating, clumping, or buildup
on probe
Dense, water based foam
Basic configuration data is
questionable
Most current device descrip-
tors (DDs) are not installed in
HART Communicator 375
handheld
SITRANS LG200 – INSTRUCTION MANUAL
Corrective Action
Reconfigure Probe Model and/
or Probe Mount, Probe Length
or Level Offset
1. Ensure the Level is accurate.
2. Verify 4 mA and 20 mA Loop
values.
Examine process to reduce/
eliminate emulsion layer.
Ensure proper Probe Model
and probe length.
Adjust trim level by the amount
of noted inaccuracy
Increase the Damping factor
until the readings stabilize.
Check Fid Spread (should be
stable within ±10 counts).
Select Fixed Threshold option
These may be expected inac-
curacies due to affect on pulse
propagation
These may be expected inac-
curacies due to affect on pulse
propagation
Set POLL ADR to 0 if not using
HART multi-drop.
Contact local HART service
centre for the latest DDs
Page 75
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