Siemens SITRANS 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 which can be downloaded
from www.siemens.com/LR200.
• The end of the shield section should protrude a minimum
of 10 mm (0.4") to avoid false echoes being reflected from
the nozzle.
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.
Coni
Conical
Environment
• Provide an environment suitable to the housing rating and materials of construction.
• Provide a sunshield if the device will be mounted in direct sunlight.
Access for programming
• Provide easy access for viewing the display and programming via the hand programmer.
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.
A5E32153438 SITRANS LR200 (PROFIBUS PA) – QUICK START MANUAL
Fl at
Flat
Parabolic
shield
preferred
undesirable
(continued on next page)
10 mm
(0.4")
100 mm
(4")
Page EN-5