Symptom
Problem
Solution
No loop current
Power supply not turned on.
Turn on power.
Insufficient source voltage.
The ES
II
requires a minimum of 12 VDC at
terminals TB1 and TB2 while the EZ requires
a minimum of 12 VDC at terminals P3 and
P4 on amplifier board.
Wires broken/improperly connected.
Check wiring.
Defective PC board.
Replace PC board.
See
Section 4.4.1 or 4.5.1
.
Zero point cannot be set to
Incorrect supply.
Check power supply.
4.00 mA at low level.
Zero incorrectly set.
Recalibrate 0% level.
Displacer hanging up.
Verify proper and level installation.
Span point cannot be increased
Incorrect supply.
Check power supply.
to 20.00 mA at high level.
Span incorrectly set.
Recalibrate unit.
Displacer hanging up.
Verify proper and level installation.
Excessive loop resistance.
Increase power supply voltage, or decrease
loop resistance (For Digital ES
II,
max 545
ohms @ 24 VDC, 450 ohms for HART; for
Analog EZ, max 480 ohms @ 24VDC).
Span point cannot be decreased
Span incorrectly set.
Recalibrate unit.
to 20.00 mA at high level.
Displacer hanging up.
Verify proper and level installation.
Loop current oscillates or hunts.
Waves or disturbances in medium.
Adjust damping via HART (ES
II
) or install
stilling well. See
Section 3.5.4
.
Loop current randomly unstable.
Waves or disturbances in medium.
Adjust damping via HART.
Power supply unstable.
Repair or replace power supply.
Electrical interference (RFI).
Consult factory for assistance.
Loop current exceeds 20.00 mA.
Incorrect calibration.
Recalibrate unit.
Material level greater than 100%.
No action required.
Supply voltage out of limits
Check power supply. Allowable voltage for
at transmitter.
ES
II
or EZ is between 12 and 36 VDC,
Excessive temperature at
Use remote transmitter mounting.
transmitter electronics.
Loop current exceeds 22.00 mA.
Check power supply (+) and (-) for
reverse wiring.
Loop current less than 4.00 mA.
Incorrect calibration.
Recalibrate unit.
Material level less than 0%.
No action required.
Supply voltage out of
Adjust power supply or
limits at transmitter.
reduce loop resistance.
Excessive temperatures at
Use remote transmitter mounting.
transmitter electronics.
Loop current 22 mA or 3.6 mA
Stem is broken, LVDT core is
Verify the unit.
fault indication (ES
II
only).
missing, LVDT wire is broken
or unplugged or circuitry failure
has occurred.
Non-linear output.
Incorrect calibration.
Recalibrate unit.
Excessive loop resistance.
Increase power supply voltage or
decrease loop resistance.
Displacer hanging up.
Verify proper and level installation.
27
48-618 ES/EZ Modulevel Displacer Level Transmitter (Top Hat Assembly Design)
