VEGA VEGAPULS 51V…54V - Manual (Page 38)

38 VEGAPULS 51 V … 54 V
4.5 Installation error
Socket piece too long
When mounting the antenna in a too long
socket piece, strong false reflections are
caused, aggravating a measurement. Note
that the horn antenna protrudes at least
10 mm out of the socket piece. When using a
rod antenna, the socket piece must have a
length of max. 100 or 60 mm (with a rod
length of 545 mm the length of the socket
piece must be max. 250 mm).
Mounting and installation - Installation error
Horn antenna: Correct and wrong length of
the socket piece
Rod antenna: Correct and wrong length of
the socket piece
Wrong
Correct Wrong
Wrong
Mounting on a vessel with parabolic tank top
Parabolic effect on dished boiler head
or basket arch vessel
Round or parabolic tank tops act for the
radar signal like a parabolic mirror. If the
radar sensor is placed to the focus of such a
parabolic tank top the sensor receives
amplified false echoes. The optimum
mounting is generally in the range of the half
vessel radius from the centre.
Correct
~ 1 /
2
vessel
radius
Wrong
< 100 mm
(250 mm)
< 100 mm
(250 mm)
Correct
> 10 mm