VEGA VEGAPULS 81 - Manual (Page 35)

VEGAPULS 64 and 81 35
Mounting and installation
4.2 Measurement of liquids
Horn antenna
Horn antenna on DIN-socket piece
Most of the time the mounting of radar sensors
is made on very short DIN-socket pieces. The
instrument flange is the reference pane for the
measuring range. The antenna should always
protrude out of the flange pipe.
Mounting on short DIN-socket piece
Mounting on a longer DIN-socket piece
Mounting on a dished boiler tank
Mounting on arched vessel ceilings
Reference pane
> 10 mm
> 10 mm
Reference pane
1 /
2
Vessel radius
When the DIN-socket piece is longer, please
note that the horn antenna must protrude at
least 10 mm out of the socket.
When mounting on dished boiler or basket
arch vessel ceilings also on the long socket
side, the antenna has to protrude at least
10 mm.
Do not mount the instrument on arched vessel
ceilings in the middle of the tank or close to
the outer wall of the vessel, but appr. 1 /
2
vessel
radius from the middle or from the outer vessel
wall. Arched tank ceilings act for the radar
signals like a paraboloidal reflector. If the
radar sensor is placed in the “focus“ of a
parabolic tank cover, the sensor receives
amplified false echoes. Note that the radar
sensor is mounted outside the “focus”, hence
parabolic amplified false echoes are avoided.