Siemens SITRANS LR250 Guide De Mise En Service Rapide page 9

Nozzle location
• Avoid central locations on tall, narrow vessels,
which can generate false echoes.
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.
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 antenna.
• There is a signal transmitted outside
the beam angle, therefore false targets
may be detected.
Emission Cone
• Keep emission cone free of interference
from ladders, pipes, I-beams or filling
streams.
Access for programming
• Provide easy access for viewing the display and programming via the handheld program-
mer.
Mounting instructions
WARNING: For pressure applications, it will be necessary to use PTFE tape or other
appropriate thread sealing compound, and to tighten the process connection
beyond hand-tight. (The maximum recommended torque is 40 N-m (30 ft.lbs.)
Note: There is no limit to the number of times a device can be rotated without damage.
Threaded Versions
1) Before inserting the device into its mounting connection, check to ensure the threads are
matching to avoid damaging them.
2) Simply screw the device into the process connection, and hand tighten, or use a wrench.
For pressure applications see Warning note above.
1)
The process pressure boundary assembly comprises the components that act as a barrier against
pressure loss from the process vessel: that is, the combination of process connection body and emit-
ter, but normally excluding the electrical enclosure.
A5E31997170
1)
SITRANS LR250 (HART) – QUICK START MANUAL
preferred
undesirable
emission
cone
beam angle:
threaded PVDF
antenna = 19°
1.5" horn = 19°
2" horn = 15°
3" horn = 10°
beam
4" horn = 8°
angle
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