Siemens LR200 Quick Start Manual page 7

Nozzle design
Notes:
• 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.
• For details on other applications, please see the full manual.
• The end of the shield section should protrude a minimum
of 10 mm (0.4") to avoid false echoes being reflected from
the nozzle.
Location on a manhole cover
• A manhole cover is typically a covered nozzle with a
diameter 610 mm (24") or greater.
• For optimum signal conditions, locate the antenna
off-center, typically 100 mm (4") from the side.
Nozzle location
WARNING: For vessels with conical or parabolic tops, avoid mounting the
instrument at the centre. (The concavity of the top can focus echoes into the centre,
giving false readings.)
Note: Under certain circumstances, it
may be acceptable to mount the device
at the centre of a flat-topped tank.
Please discuss this with your local
Siemens representative.
• 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, to avoid interference with
vessel walls or obstructions.
Page EN-6 SITRANS LR200 (HART) – QUICK START MANUAL
shield
Coni
Fl at
Flat
Conical
preferred
min. 300 mm (1ft)
per 3 m (10') of vessel
height
emission
cone
beam
angle
o
20
10 mm
(0.4")
100 mm (4")
Parabolic
undesirable
7ML19985XC81