Diagnosing and troubleshooting
10.11 Transducer ringing
HydroRanger 200 HMI
292
Operating Instructions, 06/2018, A5E36281317-AC
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
Ring down
③
Time of correct echo
②
Echo profile
④
TVT curve
Poor ring down
①
Ring down
③
TVT curve
②
Echo profile
④
Time of correct echo
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.
Summary of Contents for HydroRanger 200 HMI
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