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Troubleshooting

SITRANS LU180

Operating Instructions, 09/2021, A5E37100674-AB

The echo is not reliable and the LU180 is waiting for a valid echo

before updating the measurement.

Probable causes are:

• Material or object in contact with sensor face

• The LU180 is too close to the fill point

• The LU180 is not perpendicular to the liquid surface

• Change in level too fast

• Measurement out of range

• Foam on liquid surface

• High level of vibration in the mounting structure

• Level inside the blanking zone

The 'Waiting' period has expired. Investigate the probable causes

listed above.

Refer to Speed of response (Page 27) or Fail-safe timer (Page 29)

for duration of 'Waiting' periods.