VEGA VEGAPULS 45 VBUS - Manual (Page 27)

VEGAPULS 42, 44 and 45 – VBUS 27
< 135 mm
(250 mm)
Mounting and installation
3.5 Installation mistakes
Socket piece too long
If the sensor is mounted in a socket exten-
sion that is too long, false reflections are
caused and measurement is hindered. Make
sure that the horn antenna protrudes out of
the socket piece.
Flange antenna: Correct and unfavourable socket
length
Screw-on antenna: Correct and unfavourable socket
length
Unfavour-
able
Correct Unfavourable
Unfavourable
Mounting on a vessel with parabolic tank top
Correct
~ ½
vessel
radius
Unfavourable
Correct
Parabolic effects on dished or arched
vessel tops
Round or parabolic tank tops act like a para-
bolic mirror on the radar signals. If the radar
sensor is placed at the focal point of such a
parabolic tank top, the sensor receives am-
plified false echoes. The optimum mounting
position is generally in the range of half the
vessel radius from the centre.
Reference
plane