VEGA VEGAPULS 56V - Manual (Page 43)

VEGAPULS 56V 43
Mounting and installation
The polarisation direction is in line with the hole. The
sensor must be directed with the hole to the rows of
holes
Standpipe (pipe antenna) without venti-
lation hole
Pipe antenna systems must be provided with
a breathing hole on the upper edge of the
surge pipe. A missing hole will cause wrong
measurements.
Sensor too close to the vessel wall
If the radar sensor is mounted too close to
the vessel wall, strong interfering signals can
be caused. Build-up, rivets, screws or weld
joints superimpose their echoes to the useful
signal or useful echo. Hence note a sufficient
distance of the sensor to the vessel wall.
We recommend to choose the sensor dis-
tance such that there are no installations or
the vessel wall within the inner emission cone.
In products with bad reflection conditions, it
is useful that there are also no interfering
installations within the outer emission cone.
Note chapter "4.1 General installation instruc-
tions - Emission cone and false reflections“.
Foam generation
Strong, dense and creamy foam on the prod-
uct can cause wrong measurements. Provide
measures to avoid foam or measure in a
bypass pipe. Check if necessary the use of
another measuring principle, e.g. capacitive
electrodes or hydrostatic pressure transmit-
ters.
Pipe antenna: The surge pipe open to the bottom
must have a ventilation hole on top
Correct Wrong
Wrong polarisation direction on the
standpipe
When measuring in a surge pipe, especially if
there are holes or slots in the pipe for mixing,
it is important that the radar sensor is di-
rected to the row of holes.
The two rows of holes of the surge pipe dis-
placed by 180
°
must be in line with the polari-
sation direction of the radar signals. The
polarisation direction is in line with the hole.
The sensor is precisely directed by means of
the hole in the intermediate flange.
Hole