VEGA VEGAPULS 51K…54K 4 … 20 mA; HART compact sensor - Manual (Page 13)

VEGAPULS 51K … 54K 13
21750-EN-031222
Mounting and installation
Mounting directly on the 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.
Rod antenna
Rod antenna on DIN socket piece
The PTFE (Teflon) rod antenna is well suited
to chemically aggressive products such as
lyes and acids. Applications in the food
processing industry with aseptic vessel
conditions require nonreactive measuring
systems and very small vessel openings.
The Teflon rod antenna is not only
nonreactive, but can be mounted in very
small vessel openings (50 mm or 1½“ thread
holes).
For measurements of liquids, the Teflon rod
antenna is mounted on a straight DIN socket
piece. The socket however must not be
longer than 150 mm (when using the longer
antenna, not longer than 250 mm). The rod
antenna is available in flange sizes of DN 50,
DN 80 and DN 100.
On dished tank ends, 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 ends can act as paraboloidal
reflectors. If the radar sensor is placed in the
focal point of the parabolic tank, the radar
sensor receives amplified false echoes. The
radar sensor should be mounted outside the
focal point. Parabolically amplified echoes are
thereby avoided.
Rod antenna on DIN socket piece
≤ 50 mm, 100 mm or
250 mm
Vessel center or
symmetric axis
Rod antenna directly on the vessel open-
ing
Rod antenna directly on the vessel opening
Opening
ø 50 mm