Siemens Sitrans LR250, Руководство по эксплуатации, Страница: 89 / 306

Remote operation
7.1 Operating via SIMATIC PDM
SITRANS LR250 (PROFIBUS PA)
Operating Instructions, 08/2014, A5E32221386-AC
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①
TVT
②
Cursor
③
Echo profile
● Initial profile graph is blank upon entry to dialog. Click on Measure to view and upload the
current TVT from device.
● Change the position of the cursor on the TVT using the Point+ and Point– buttons: raise and
lower the TVT using and Offset-.
● Alternatively, enter values for Point and Offset directly into the dialog boxes.
● Click on Transfer to Device.
7.1.5.2 Auto false echo suppression
Note
• Ensure material level is below all known obstructions when using Auto False Echo
Suppression to learn the echo profile. An empty or almost empty vessel is recommended.
•
Note the distance to material level when learning the echo profile, and set Auto False
Echo Suppression Range to a shorter distance to avoid the material echo being screened
out.
• Set Auto False Echo Suppression and Auto False Echo Suppression Range during
startup, if possible.
•
If the vessel contains an agitator it should be running.
• Before adjusting these parameters, rotate the device for best signal (lower false-echo
amplitude).