VEGA VEGAPULS 45 4 … 20 mA; HART compact sensor - Manual (Page 14)

14 VEGAPULS 42, 44 and 45 – 4 … 20 mA
Mounting directly on flat vessel top
Reference plane
Mounting on round vessel tops
Reference plane
½ vessel radius
Horn antenna directly on the vessel top
If the stability of the vessel will allow it (sensor
weight), flat mounting directly on the vessel
top is a good and cost-effective solution. The
top side of the vessel is the reference plane.
On dished vessel tops, please do not mount
the instrument in the centre or close to the
vessel wall, but approx.½ vessel radius from
the centre or from the vessel wall.
Dished tank tops can act as paraboloidal
reflectors. If the radar sensor is placed in the
focal point of the parabolic tank top, the radar
sensor receives amplified false echoes. The
radar sensor should be mounted outside the
focal point. Parabolically amplified echoes are
thereby avoided.
Vessel center or
symmetric axis
Mounting and installation
Mounting on DIN socket piece
In vessel with dished or rounded tops, the
antenna length should at least correspond to
the length of the socket.
Mounting on a dished vessel top; max. socket length
dependent on the flange size and possibly on the
antenna extension (see „7.3 Dimensions“).
3.2 Measurement of liquids
Flange antennas
Horn antenna on DIN socket piece
Radar sensors are usually mounted on short
DIN socket pieces. The lower side of the
instrument flange is the reference plane for
the measuring range. The antenna must
always protrude out of the flange pipe.
If the DIN socket piece is longer, please
make sure that the horn antenna still pro-
trudes out of the socket.
Vessel center or
symmetric axis
Reference plane
< 135 mm (DN 50)
< 210 mm (DN 80)
< 310 mm (DN 100, DN 150)
<135…310mm
(250…425mm
with antenna
extension)