VEGA VEGAPULS 56K - Manual (Page 9)

VEGAPULS 56K 9
22915-EN-041227
Pipe antenna
Pipe antennas on surge or by-
pass tubes form a complete
antenna system in conjunction
with a measuring pipe (which
can also be bent). Pipe antennas
are best suited for products with
extreme turbulence or products
with low dielectric constant.
The antenna can be configured
with or without horn. Antennas
with horn are characterized by
very high antenna gain - reliable
measurement results are
achieved even in case of prod-
ucts with very bad reflection
properties.
The measuring pipe constitutes
a conductor for radar signals.
The running period of the radar
signals changes in the pipe and
depends on the pipe diameter.
The pipe inner diameter must be
programmed into the electronics
so that the running period can
be compensated.
Product description
1.4 Antennas
The antenna is the eye of the radar sensor.
The shape of the antenna, however, doesn’t
give a casual observer the slightest clue on
how carefully the antenna geometry must be
adapted to the physical properties of electro-
magnetic waves. The geometrical form deter-
mines focal properties and sensitivity - the
same way it determines the sensitivity of a
unidirectional microphone.
Various antenna configurations are available
for different applications and process condi-
tions. Beside the focussing properties, each
is characterised by special chemical and
physical features.
Horn antennas
Horn antennas focus the radar signals very
well. Manufactured of
1.4571 (StSt) or Hastelloy
C22 they are very rugged
and physically as well as
chemically resistant.
Horn antennas are used for
measurement in closed or
open vessels.
DN 150
DN 250
DN 50
DN 80