Siemens sitrans LR 400 Instruction Manual page 21

Beam Spreading
Correct Installation in Mounting Nozzle
The bottom edge of the antenna must project into the vessel to avoid reflective
interference at the wall of the nozzle. Above flange size DN 150/6 inch, the antenna need
not project beyond the nozzle unless the radiation cone (the extension of the antenna's
angle) touches the nozzle wall.
Installation using Easy Aimer LR
0.38"
(10 mm)
Long horn 9.3"( 235 mm )
Short Horn 7.4"(188 mm)
7ML19985FH03
Keep the emission cone
(9° or 13° depending on
configuration), free of
obstructions.
short horn antenna
13°
long horn antenna
9°
SITRANS LR
SITRANS LR 400 – INSTRUCTION MANUAL
10 mm
top clamping plate (upper socket)
bottom clamping plate (lower socket)
customer gasket (recommended
thickness 1.5 to 1.8 mm (0.06 to
0.07")), as required
customer mounting plate with at
least ø 4" (102 mm) central
opening, as required
30°
max.
Page 17