Echo Processing; Process Intelligence; Echo Selection; A.3 Echo Processing - Siemens SITRANS LR560 Operating Instructions Manual

Technical reference

A.3 Echo processing

A.3

Echo processing

A.3.1

Process Intelligence

The signal processing technology embedded in Siemens radar level devices is known as
Process Intelligence.
Process intelligence provides high measurement reliability regardless of the dynamically
changing conditions within the vessel being monitored. The embedded Process Intelligence
dynamically adjusts to the constantly changing material surfaces within these vessels.
Process Intelligence is able to differentiate between the true microwave reflections from the
surface of the material and unwanted reflections being returned from obstructions such as seam
welds or supports within a vessel. The result is repeatable, fast and reliable measurement. This
technology was developed as result of field data gained over some twenty years from more than
1,000,000 installations in many industries around the world.
Higher order mathematical techniques and algorithms are used to provide intelligent processing
of microwave reflection profiles. This "knowledge based" technique produces superior
performance and reliability.
A.3.2

Echo selection

Time Varying Threshold (TVT)
A Time Varying Threshold (TVT) hovers above the echo profile to screen out unwanted
reflections (false echoes).
In most cases the material echo is the only one which rises above the default TVT.
In a vessel with obstructions, a false echo may occur, see SHAPER MODE (2.8.4.) (Page 184)
for more details.
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SITRANS LR560 (mA/HART)
Operating Instructions, 06/2017, A5E34647946-AD