39
48-640 E3 Modulevel
®
Displacer Level Transmitter - F
OUNDATION
fieldbus
™
Symptom
Problem
Solution
No output signal.
Power supply not turned on. Turn on power.
Insufficient source voltage.
Minimum of 9 VDC required at the wiring board. Verify supply voltage.
Improperly wired or
damaged wiring.
Check wiring and connections.
Defective electronics.
Replace PC board assembly or wiring board as required.
LEVEL and % OUTPUT
values are inaccurate.
Basic configuration data is
questionable.
Verify Level Offset values.
If using factory calibration, verify that Process SG and Operating
Temperature values are accurate.
Verify/confirm that Model Parameters are accurate.
Confirm set points are as expected.
Transmitter does not
track level.
Model incompatible with
process liquid
Verify model in use is appropriate for process liquid SG.
Possible damage to unit.
Check displacer, spring, stem and enclosing tube for damage.
Replace all damaged parts.
Possible material buildup
Check displacer, spring, stem, enclosing tube and displacer for
buildup of process material. Clean any fouled parts.
Displacer, spring or stem
dragging on inside of
chamber, e-tube.
Verify proper and level installation (within 3 degrees of plumb in all
directions).
LEVEL and % OUTPUT
values fluctuate.
Liquid turbulence.
Increase damping until output stabilizes or install stilling well.
Power supply unstable.
Repair or replace power supply.
Electrical interference (RFI).
Consult factory for assistance.
Output jumps quickly
over wide range
Bent stem impeding smooth
core movement
Review Status History for Surge event. Inspect stem and replace if
damaged.
Non-linear output.
Displacer hanging up.
Verify proper and level installation (within 3 degrees of plumb in all
directions.)
Bent stem.
Check stem. Replace if damaged.
Possible material buildup
Check displacer, spring, stem, enclosing tube and displacer for
buildup of process material. Clean any fouled parts.
8.3.1 troubleshooting System Problems
