Siemens LR 460 Manual De Usuario
Page A-72
SITRANS LR 460 – INSTRUCTION MANUAL
7ML19985JM01
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Echo Processing
Profile monitoring via SIMATIC PDM
To view an echo profile open the menu View – Profile.
You will see the echo profile, the Time Varying Threshold (TVT), and a vertical line
indicating the distance from the sensor to the echo selected.
indicating the distance from the sensor to the echo selected.
Echo strength is indicated on the Profile (dB) vertical axis. The distance shown on the
horizontal axis is the distance from the sensor to the target.
horizontal axis is the distance from the sensor to the target.
Time Varying Threshold (TVT)
The TVT is a threshold curve used to detect the presence of significant echoes. See
on page 73 for more detail.
Echo selection
The device considers all peaks that are above the TVT as a potential good echo.
Each peak gets a rating based on its strength, area, height above the TVT, and other
parameters. The true echo is selected based on the setting for
parameters. The true echo is selected based on the setting for
echo profile
echo distance
TVT curve