Siemens SITRANS LR250 Kompaktbetriebsanleitung Seite 14

4.3.3 Nozzle location
● Avoid central locations on tall, narrow vessels
● Nozzle must be vertical and clear of imperfections
Beam angle
Note
Beam width depends on antenna size and is approximate: see table below.
•
● Beam angle is the width of the cone where the energy density is half of the peak energy density.
● The peak energy density is directly in front of and in line with the antenna.
● There is a signal transmitted outside the beam angle, therefore false targets may be detected.
Horn antenna
Threaded PVDF antenna
①
Emission cone
②
Beam angle
12
Preferred
Undesirable
Flanged encapsulated antenna
Hygienic encapsulated antenna
SITRANS LR250 (FOUNDATION FIELDBUS)
A5E33472700-AA, 08/2014