Transducer Ringing - Siemens HydroRanger 200 HMI Operating Instructions Manual

Diagnosing and troubleshooting

10.11 Transducer ringing

If multiple echoes appear on the echo profile, typical of a flat material profile (especially if the
vessel top is domed), use the "TF " (True First) algorithm.
Should a stable measurement still not be attainable, contact Siemens representative.
10.11 Transducer ringing
If the transducer is mounted too tightly, or if it is mounted so that its side touches something
(such as a vessel wall, or standpipe), its resonance characteristics change and this can
cause problems. Hand tighten only. PTFE tape is not recommended as it reduces friction
resulting in a tighter connection that can lead to ringing.
Normal ring down
①
②
Poor ring down
①
②
Ring down times that extend into the valid measurement range can be interpreted by the
device as the material level, and reported as a steady high level.
292
③
Ring down
④
Echo profile
③
Ring down
④
Echo profile
Time of correct echo
TVT curve
TVT curve
Time of correct echo
Operating Instructions, 06/2018, A5E36281317-AC
HydroRanger 200 HMI