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Diagnosing and Troubleshooting
11.9 Transducer Ringing
11.8.3
Adjust the Echo Algorithm
Use SIMATIC PDM to view echo profiles and make adjustments to the Algorithm parameter.
See Algorithm (2.12.2.1.) (Page 224).
If the "TRACKER" algorithm is used and narrow noise spikes are evident on the Echo Profile,
widen the Narrow Echo Filter (2.12.2.4.) (Page 225). Also, if the true echo has jagged peaks,
use Reform Echo (2.12.2.3.) (Page 225).
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.
11.9
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.
11.9.1
Normal Ring Down
①
②
③
④
286
Ring down
TVT Curve
Echo profile
Time of correct echo
Operating Instructions, 04/2021, A5E33329501-AG
SITRANS LUT400
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Table of Contents
Troubleshooting
