Orientation In A Vessel With Obstructions; Mounting On A Stillpipe Or Bypass Pipe - Siemens SITRANS LR250 Operating Instructions Manual

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
turbulent conditions exist. It can also be used to provide optimum signal conditions on
foaming materials.
Stillpipe or Bypass Pipe requirements
• The pipe diameter must be matched with the horn size. Use the largest horn size
that will fit the stillpipe/bypass pipe (see
Flanged Horn dimensions
• Suitable pipe diameters: 40 mm (1.5") to 100 mm (4").
[Not recommended:
• One continuous length of metallic pipe is preferred, without joints (to avoid false
echoes).
• Joints (if unavoidable) must be machined to ± 0.25 mm (± 0.010") and must have a
welded connecting sleeve on the outside
• Bypass vent is required at the upper end of the bypass
1)
Dielectric constant of material measured
See
2)
To equalize pressure and keep the liquid level in the bypass constant with the liquid
level in the vessel.
Page 20 SITRANS LR250 (FF) – OPERATING INSTRUCTIONS
polarization axis
polarization reference
point
display
on page 14).
152.4 mm (6") or 203.2 mm (8")]
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
on a Stillpipe or Bypass Pipe
for an illustration.)
1)
, or when vortex or extremely
Threaded Horn dimensions
2)
on page 7.
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)
with FFKM O-ring:
–20 to +200 °C
(–4 to +392 °F)
Mounting
on page 20
on page 11 or
7ML1998KL01