Siemens SITRANS L Manual de instrucciones - Página 31
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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.
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