User Manual

VEGAPULS 42 and 44 – 4 … 20 mA 43
Mounting and installation
ø50
> 300 mm
Tube antenna system with ball valve cutoff in measur-
ing tube
Ball valve
Vent hole
The more inhomogeneous the measured
product, the closer the openings should be
spaced.
Due to radar signal polarisation, the holes or
slots must be positioned in two rows offset
by 180°.
The radar sensor must then be mounted so
that the type label of the sensor is aligned
with the rows of holes.
Every wider slot causes a false echo. The
slots should therefore not exceed a width of
10 mm, to keep the signal-to-noise ratio at a
minimum. Round slot ends are better than
rectangular ones.
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).
Deflector
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. The valve must not have
any rough edges or constrictions in its chan-
nel, and should be located at least 300 mm
from the sensor flange.
ø 5...10
VEGAPULS 44: Rows of holes on one axis with the
type label
Type label