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Rosemount Tank Radar REX
Chapter 10 Mechanical Installation
10-6
Installation Manual
308014EN, Edition 4
May 2013
10.2 Mounting the Parabolic Antenna Gauge
See also Mechancial Installation drawings 9150072-982, 9240003-944, -
947 for further information.
10.2.1 Inclination
The inclination of the gauge should not exceed 1.5 ° towards the center 
of the tank. For products with high condensation, like bitumen/asphalt 
applications, the radar beam should be directed vertically without any 
inclination. 
The RTG 3930 is mounted on the tank nozzle by using the Flange Ball. 
The Flange Ball is designed to make it easy to adjust the inclination of 
the transmitter within the specified limits.
There are two versions of the Flange Ball: T30 and T38-W. Model T 38-
W is welded on the flange. Model T 30 is attached to the flange with a 
nut. The Flange Ball must be mounted on the tank flange prior to 
mounting the gauge on the tank nozzle.
Inclination - Flange Ball model T30
For Flange Ball model T30 the flange may lean a maximum of 4.5° away 
from the tank wall, and a maximum of 2° towards the tank wall. It must 
also be horizontal within ±3° along the tank wall, see Figure 10-4, 
Figure 10-5 and Figure 10-6.
Figure 10-4. Maximum inclination of flange along the tank wall.
3930_FlangeReq_1.eps