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3-5
Rosemount Tank Radar REX
Chapter 3 Description of 3900 REX
Installation Manual
308014EN, Edition 4
May 2013
3.2 Antenna Types
The Horn Antenna Gauge,
RTG 3920
The Horn Antenna Gauge is
designed for an 8” antenna to be
used in small size openings on tanks
with fixed roofs.
The RTG 3920 is designed for mea-
surement of a variety of oil products
and chemicals. However, for bitu-
men/asphalt and similar products the
Parabolic antenna is recommended.
The Parabolic Antenna Gauge,
RTG 3930
The Parabolic Antenna Gauge mea-
sures level of all types of liquids, from
light products to bitumen/asphalt.
The gauge is designed for mounting
on tanks with fixed roofs and has
custody transfer accuracy.
The design of the parabolic antenna
provides extreme tolerance against
sticky and condensing products. The
narrow beam of this antenna makes
it very suitable in narrow tanks with
internal structures.
Figure 3-5. The RTG 3920 Horn Antenna Gauge
Transmitter
Head
Weather
Protection
Hood
Horn
Antenna
Tank Nozzle
Min. 8"
Figure 3-6. The RTG 3930 Parabolic
Antenna Gauge
Transmitter
Head
Weather
Protection
Hood
Parabolic
Reflector
Antenna Feeder
0.44 m
0.75 m