Page EN-6
SITRANS LR250 (FF) – QUICK START MANUAL
7ML19985XN82
mm
mm
m
E
n
glis
h
Nozzle location
Avoid central locations on tall, narrow vessels.
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.
• Peak energy density is directly in front
of and in line with the antenna.
• Signal is 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
programmer
Mounting instructions
Threaded Versions
1)
Before inserting the instrument into its mounting connection, check to ensure the threads
are matching to avoid damaging them.
2) Simply screw the instrument into the process connection, and hand tighten, or use a
wrench. For pressure applications see Warning note above.
Flanged Versions
WARNING: For pressure applications use PTFE tape or other appropriate thread
sealing compound and 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 an instrument can be rotated without damage.
• When mounting, orient the front or back of the instrument towards the closest wall.
• Do not rotate the enclosure after programming and vessel calibration, otherwise an error
may occur, caused by a polarity shift of the transmit pulse.
WARNING: The user is responsible for the selection of bolting and gasket materials
which will fall within the limits of the flange and its intended use, and which are
suitable for the service conditions.
preferred
undesirable
beam angle:
threaded PVDF
antenna = 19°
1.5" horn = 19°
2" horn
= 15°
3" horn
= 10°
4" horn
= 8°
beam
angle
emission
cone
