VEGA VEGAPULS 45 VBUS - Manual (Page 13)

VEGAPULS 42, 44 and 45 – VBUS 13
VEGAPULS 44
pipe antenna
composed of
horn antenna and
bypass tube
VEGAPULS 42
pipe antenna
composed of
horn antenna and
bypass tube Pipe antennas
Pipe antennas composed of horn antenna
and standpipe or bypass tube
Horn antennas on a stand-
pipe or bypass tube form a
complete antenna system in
conjunction with a measuring
pipe (which must not be
perfectly straight, but can
also have bends). For the
radar signals, the measuring
pipe acts as a conductor.
The running time of the radar
signal changes in the pipe
and depends on the pipe
diameter. The sensor must
be therefore informed about
the tube inner diameter so
that the running time can be
taken into account and
precise level signals are
delivered. Pipe antennas are
best suited for turbulent
applications and products
with very low dielectric con-
stant.
The antennas are
characterised by a very high
antenna gain. As a result,
high reliability is achieved
even with products having
very poor reflection proper-
ties.
Pipe antenna integrated in the sensor
VEGAPULS 45 series originated as a further
development of VEGAPULS 42 and 44
sensors combined with a surge pipe or
bypass tube. This sensor is equipped with
an optimised measuring tube up to 4 m long
and enables high precision level
measurement also in products with very
small dielectric figures of
ε
r
= 1,4 … 1,8 (e.g.
liquid gas).
VEGAPULS 45
with thread, pipe
antenna inte-
grated in the
sensor
VEGAPULS 45
with flange, pipe
antenna inte-
grated in the
sensor
Types and versions