Emerson Rosemount 5900S Series Reference Manual page 33

Reference Manual
00809-0100-5900, Rev CA
June 2014
Table 3-2. Minimum distance L
to tank wall for the 5900S with
Horn Antenna
Figure 3-2. Two different flange
options are available
Antenna axis
Vertical plumb line
HORIZONTAL FLANGE
Section 3. Installation
Free Space Requirements
There are two flanges available for the Horn Antenna gauge. One flange has
a 4° inclination and the other is horizontal. See installation drawing for flange
dimensions.
The horizontal flange can be used if the wall does not intrude into the 30°
wide radar beam from the Horn Antenna. If a vertical antenna axis installation
is not possible without the tank wall intruding into the radar beam, the 5900S
has to be directed away from the wall by using the 4° flange. The inclination is
necessary to ensure maximum accuracy.
The minimum free space distance L:
Flange
Horizontal flange
4° flange
(1) In exceptional cases the 5900S with Horn Antenna can be installed closer to
the tank wall if required. Please contact Emerson Process Management /
Rosemount Tank Gauging for advice.
In certain cases, when maximum accuracy is not required, the horizontal
flange can be used even if the wall intrudes into the radar beam. In doubtful
cases, please contact Emerson Process Management / Rosemount Tank
Gauging or one of its representatives for advice.
Service space 550 mm
Service space 500 mm
Tank wall
30° radar beam
L
Minimum distance L to tank wall (m)
Rx0.2 (R=tank reference height)
(1)
0.6
Antenna axis
30° radar beam
4° ± 1°
INCLINED FLANGE
Rosemount 5900S Series
Tank wall
Vertical plumb line
L
3-5