VEGA VEGAPULS 56K - Manual (Page 23)

VEGAPULS 56K 23
22915-EN-041227
Mounting and installation
The polarisation direction is in one plane with the
marking hole. The sensor must be directed with the
marking hole to the row of holes.
Standpipe (pipe antenna) without venti-
lation hole
Pipe antenna systems must be provided with
a ventilation hole on the upper end of the
surge pipe. If this hole is absent, incorrect
measurements will result.
Sensor too close to the vessel wall
Strong false echoes can also result if the
radar sensor is mounted too close to the
vessel wall. Buildup, rivets, screws or weld
joints superimpose their echoes onto the
product i.e. useful echo. Please ensure a
sufficient distance from the sensor to the
vessel wall.
We recommend locating the sensor where
there is no vessel wall within the inner emis-
sion cone.
For products with less favourable reflection
conditions, it is a good idea to also keep the
outer emission cone free of interfering instal-
lations. Note chapter "3.1 General installation
instructions - Emission cone and false ech-
oes“.
Foam generation
Thick, dense and creamy foam on the prod-
uct can cause incorrect measurements. Take
measures to avoid foam, measure in a by-
pass tube or use another measurement tech-
nology, e.g. capacitive electrodes or
hydrostatic pressure transmitters.
Pipe antenna: The surge pipe open to the bottom
must have a ventilation hole
Correct Incorrect
Wrong polarisation direction on the
standpipe
When measuring in a surge pipe, especially if
there are holes or slots for mixing in the tube,
it is important that the radar sensor is aligned
with the rows of holes.
The two rows of holes (displaced by 180°) of
the measuring tube must be in one plane with
the polarisation direction of the radar signals.
The polarisation direction is in the same plane
as the marking hole. You direct the sensor
precisely by means of the marking hole in the
intermediate flange.
Marking hole