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7ML19985KA02
SITRANS LG200 – INSTRUCTION MANUAL
Page 75
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Appendix B: Troubleshooting
System Issues
WARNING: Explosion hazard. Do not connect or disconnect equipment unless
power has been switched off or the area is known to be non-hazardous.
Symptom
Problem
Corrective Action
LEVEL, % OUTPUT and
LOOP values are all
inaccurate
Basic configuration data is
questionable
Interface level has signifi-
cant emulsion.
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.
Level readings are
repeatable but consis-
tently high or low from
actual by a fixed
amount
Configuration data does not
accurately match probe
length or tank height.
Ensure proper Probe Model
and probe length.
Adjust trim level by the amount
of noted inaccuracy
Level, % Output and
Loop values fluctuate
Turbulence
High Frequency connection
Increase the Damping factor
until the readings stabilize.
Check Fid Spread (should be
stable within ±10 counts).
Level, % Output and
Loop values all read-
ing low vs. actual
Lower dielectric material
over higher dielectric mate-
rial, e.g. oil over water
Coating, clumping, or buildup
on probe
Dense, water based foam
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
Level reading on Dis-
play is correct but
Loop is stuck on 4 mA
Basic configuration data is
questionable
Set POLL ADR to 0 if not using
HART multi-drop.
HART device only:
handheld will only
read universal com-
mands
Most current device descrip-
tors (DDs) are not installed in
HART Communicator 375
handheld
Contact local HART service
centre for the latest DDs
Содержание 7ML1301-1
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Страница 96: ...Page 92 SITRANS LG200 INSTRUCTION MANUAL 7ML19985KA02 Hazardous Installation ...