Troubleshooting - Omega LVU800 Series User Manual

APPENDIX

Troubleshooting:

PROBLEM
TANK does not appear on
the main menu:
Display shows FULL:
Display shows EMPTY:
Display shows WARMUP:
Display shows LOST:
Display is opposite of the
measured value:
Transmitter indicates a
current of 0 mA:
Transmitter jumps to a
current reading between
19 and 20 mA:
Transmitter indicates a
current over 23 mA:
Units function is set for PERCENT on LVU800 Series:
When Units is set for PERCENT, the TANK function is
disabled. To re‐enable TANK, change units to INCHES,
CM, FEET or METERS.
Level of liquid is above the FILL‐H setting: Check the
FILL‐H setting, making sure the FILL‐H setting is high
enough so the level of liquid is below the FILL‐H setting.
The Fill‐H setting is the distance from the bottom of the
tank to the Full level of liquid.
Level of liquid is beyond the HEIGHT setting: Check the
HEIGHT setting, making sure the HEIGHT setting is low
enough so the level of liquid is above the HEIGHT
setting.
Typically occurs when power is being applied to
transmitter. Indicates a weak power supply, bad wire
connections or the sensor is out of the operational
range.
Sensor is in a Fail‐Safe state. The return sound pulses
are not reaching the transducer. First, cycle power off
and on, waiting 5 seconds between the off and on
states. If problem persists, check the installation fitting
against the Installation instructions in the manual.
Check the DISPLAY setting. AIR mode indicates the
distance from the liquid to the sensor. LIQUID mode
indicates the height of liquid in the tank. Change the
DISPLAY mode from AIR to LIQUID or vice versa to
correct.
Check the wiring for an open circuit. An open circuit is
the most common issue with a 0 mA signal.
Check the installation of the transmitter. Bad
installation fittings will cause false signals near the top
of the tank, which typically translates to a signal
between 19 and 20 mA. Also look for interference just
below the transmitter. If the transmitter is installed in a
metal fitting, switch to a plastic fitting.
Immediately check the wiring for a short circuit. The
LVU800 Series is current limited to 22 mA. Anything
above 23 mA indicates a short circuit.
SOLUTION
22
Step Seven