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Installing/mounting
4.3 Nozzle location
SITRANS Probe LR with mA/HART
Operating Instructions, 05/2019, A5E32337711-AC
21
4.3
Nozzle location
Beam angle
●
Beam angle is the width of the cone where the energy density is half of the peak energy
density.
●
The peak energy density is directly in front of and in line with the rod antenna.
●
There is a signal transmitted outside the beam angle, therefore false targets may be
detected.
①
Min. 300 mm (1 ft) per 3 m (10') of vessel height
②
Emission cone
③
Beam angle 28°
Emission cone
●
Keep emission cone free of interference from ladders, pipes, I-beams or filling streams.
●
Locate the antenna away from the side wall, to avoid interference from indirect echoes.
●
Make allowance for the emission cone spreading: allow a minimum of 300 mm (1 ft) for
every 3 m (10 ft) of vessel height.
4.4
Nozzle design
Note
Nozzle design
•
For nozzles 100 mm (4") in length or shorter, use the 100 mm (4") shield.
•
For nozzles 250 mm (10") in length or shorter, use the 250 mm (10") shield.