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Troubleshooting
7.1
Troubleshooting
SITRANS LU150
Operating Instructions, 03/2016, A5E34590123-AB
The echo is not reliable and the LU150 is waiting for a valid echo
before updating the measurement.
Probable causes are:
• Material or object in contact with sensor face
• The LU150 is too close to the fill point
• The LU150 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 caus-
es listed above.
Refer to Speed of response (Page 29) or Fail-safe timer
(Page 31) for duration of 'Waiting' periods.
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