SITRANS LU180
Operating Instructions, 06/2016, A5E37100674-AA
35
Troubleshooting
7
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 caus-
es listed above.
Refer to Speed of response (Page 30) or Fail-safe timer
(Page 33) for duration of 'Waiting' periods.
Summary of Contents for Sitrans LU-180
Page 1: ...Operating Instructions LU 180 Sitrans LU 180 Edition 06 2016 Ultrasonic Transmitters ...
Page 7: ...Introduction SITRANS LU180 6 Operating Instructions 06 2016 A5E37100674 AA ...
Page 9: ...Description SITRANS LU180 8 Operating Instructions 06 2016 A5E37100674 AA ...
Page 37: ...Troubleshooting SITRANS LU180 36 Operating Instructions 06 2016 A5E37100674 AA ...
Page 41: ...Technical data 8 7 Approvals SITRANS LU180 40 Operating Instructions 06 2016 A5E37100674 AA ...