Echo Selection - Siemens SITRANS LR200 7ML5422 Operating Instructions Manual

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.
B.2.2

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 Auto False Echo Suppression
(Page 115) for more details.
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③
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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.
172
default TVT
echo profile
material level
echo marker
SITRANS LR200 with mA/HART
Operating Instructions, 05/2019, A5E32337676-AE