VEGA VEGAPULS 56 Profibus PA - Manual (Page 28)

28 VEGAPULS 56 Profibus PA
The sensor must be directed with the marking hole to
the rows of holes or openings.
Marking
hole
DN 50
ø50
Mounting and installation
Tube antenna system with ball valve cutoff in measur-
ing tube
Ball valve
Rows of holes in one axis with the marking hole
Polarisation direction
Due to radar polarisation, the holes or slots
must be positioned in two rows offset by
180°. The radar sensor must be mounted so
that the marking hole of the sensor (located in
the intermediate flange) is on one axis with
the row of holes in the standpipe.
Surge pipe with ball valve
If a ball valve is mounted in the surge pipe,
maintenance and servicing can be carried
out without opening the vessel (e.g. if it con-
tains liquid gas or toxic products).
A prerequisite for trouble-free operation is a
ball valve throat that corresponds to the pipe
diameter and provides a flush surface with
the pipe inner wall.
Make sure there is a ventilation hole in the
standpipe.
Standpipe ventilation
Marking hole
Deflector
Correct Wrong