Liquid Splashing; Adjust The Echo Algorithm; Transducer Ringing; Normal Ring Down - Siemens SITRANS LUT400 Operating Instructions Manual

11.8.2

Liquid Splashing

If the material monitored is a liquid, check for splashing in the vessel. Enter a lower
Response Rate value (see Quick Start (Page 59)) to stabilize the Reading, or install a stilling
well. (Contact Siemens representative.)
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 220).
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 221). Also, if the true echo has jagged peaks,
use Reform Echo (2.12.2.3.) (Page 221).
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
282
Ring down
TVT Curve
Echo profile
Time of correct echo
Operating Instructions, 07/2019, A5E33329501-AC
SITRANS LUT400