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

Echo Processing

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.

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
(2.8.4.)
on page 137 for more details.
The device characterizes all echoes that
rise above the TVT as potential good echoes. Each peak is assigned a rating based on its
strength, area, height above the TVT, and reliability, amongst other characteristics.
Page 134 SITRANS LR560 (mA/HART) – OPERATING INSTRUCTIONS
Shaper Mode
default TVT
echo profile
material
level
echo marker
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