VEGA VEGAPULS 81 - Manual (Page 47)

VEGAPULS 64 and 81 47
Mounting and installation: Installation fault
Pipe antenna on a surge pipe without
ventilation hole
Pipe antenna systems must be provided with a
breathing hole on the upper edge of the surge
pipe. A missing hole will cause faulty measure-
ments.
Pipe antenna: The surge pipe oen to the bot-
tom must have a ventilation or breathing hole
on top
VEGAPULS 64 on a surge pipe: The polariza-
tion direction is in line with the type plate. The
sensor must be directed with the type plate to
the rows of holes
Wrong
Wrong mounting on the vessel with parabolic
tank ceiling
Pipe antenna, wrong polarization
direction
When measuring in a surge pipe, especially if
there are holes in the pipe for mixing, it is
important that the radar sensor is directed to
the rwo of holes.
The two rows of holes of the surge pipe dis-
placed by 180 ° must be in line with the polari-
zation direction of the radar signals. The po-
larization direction is either in line with position
where the type plate is fixed (VEGAPULS 64)
or in line with the casting nose on the lower
part of the housing (VEGAPULS 81).
Type plate
Correct Wrong
Correct Wrong