VEGA VEGAPULS 56V - Manual (Page 33)

VEGAPULS 56V 33
Reference plane
Mounting on dished vessel end
Reference plane
1 /
2
vessel radius
Mounting and installation
Mounting directly on flat vessel top
Sensor directly on the vessel top
Dependent on the construction of the vessel
(sensor weight), flat mounting directly on the
vessel top would be a favourable solution.
The top side of the vessel is the reference
plane.
Do not mount the transmitter in the centre of
the dished end of the tank or close to the wall
of the vessel, but approx.
1 /
2
vessel radius
from the middle or from the outer wall of the
vessel.
Dished tank ends can act as paraboloidal
reflectors. If the radar sensor is placed in the
"focus“ of a parabolic tank end, the sensor
receives amplified false echoes. The radar
sensor must be mounted outside the "focus“
hence parabolic amplified echoes are
avoided.
Mounting on dished end vessel
>␣ 10␣ mm
4.3 Measurement in a standpipe
(surge or bypass pipe)
General instructions
Pipe antennas are an option in vessels which
are mechanically complex or where the prod-
uct surface is very turbulent.
By focusing of the radar signals within the
measuring pipe, also products with small
dielectric constant figures (
ε
r
= 1,6 to 3) can
be reliably measured.
The surge pipes which are open at the bot-
tom must extend over the full measuring
range (i.e. down to 0% level).
Suitable will be a deflector at the tube end.
The medium is therefore reliably detected in
the range of the min. level. This is mainly
important for mediums with a dielectric con-
stant figure of less than 5.