Rosemount TankRadar Rex
Chapter 1 Checks and Adjustments
1-8
Commissioning Manual
308011En, Ed.2/Rev.B
June 2008
1.9
RTG 3920
1.9.1
Tank Information
•
Check if there is water at the bottom of the tank.
1.9.2
Visual check
•
Free space below the RTG
. Normally girders and pipes are not
allowed in the radar beam. If there are disturbing objects below the
antenna, the effect on the current measurement must be carefully
evaluated.
•
Check that waveguide, closing and antenna are mounted correctly
and take appropriate actions in order to replace broken parts.
1.9.3
Tank measurements
•
Diameter of the manhole
and the
socket height
. The socket
must not be higher than 330 mm.
•
Note the distance X (mm) between the tank wall and the center of
the RTG. It will be used for calculations of the clearance angle
below the antenna.
1.9.4
Free space requirements
•
Check the
Clearance Angle
plumbline tankwall (arctan X/R). If
the clearance angle is less than 15°, the RTG must be inclined
away from the wall.
Figure 1-6
Inclination.
Antenna axis
30° radar beam
Vertical plumb line
Inclination 4° ±1°
Antenna axis
30° radar beam
Use the 4° flange if the
clearance angle is less
than 15°.
Vertical plumb
line
