Page 16 SITRANS LR250 (PROFIBUS PA) – INSTRUCTION MANUAL 7ML19985JF02
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Installation
Nozzle location (continued)
• Provide easy access for viewing
the display and programming via
the hand programmer.
• Provide an environment suitable
to the housing rating and
materials of construction.
• Provide a sunshield if the
instrument will be mounted in
direct sunlight.
Orientation in a vessel with obstructions
Polarization reference point
Mounting on a Stillpipe or Bypass Pipe
A stillpipe or bypass is used for products with a low dK
1)
, or when vortex or extremely
turbulent conditions exist. It can also be used to provide optimum signal conditions on
foaming materials.
Stillpipe or Bypass Pipe requirements
An installation drawing number 23650689 is available from the product page of our
website. Go to: www.siemens.com/LR250 and click on Downloads.
• The pipe diameter must be matched with the horn size. Use the largest horn size
that will fit the stillpipe/bypass pipe (see
Flat Face Flange
on page 10).
• Suitable pipe diameters: 40 mm (1.5") to 100 mm (4”).
Not recommended: (152.4 mm / 6" or 203.2 mm / 8")
• One continuous length of metallic pipe is preferred, without joints (to avoid false
echoes).
1)
See
Dielectric constant of material measured
on page 5.
ambient temperature
–40 °C to 80 °C
(–40 °F to 176 °F)
process temperature
(with FKM O-ring)
–40 to +200 °C
(–40 to +392 °F)
polarization reference
point
polarization axis
display
For best results on a vessel with
obstructions, or a stillpipe with openings,
orient the front or back of the device
toward the obstructions (see
Mounting
on a Stillpipe or Bypass Pipe
on page 16
for an illustration.)
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