Mounting On A Stillpipe Or Bypass Pipe; Stillpipe Or Bypass Pipe Requirements - Siemens sitrans LR200 Instruction Manual

Mounting on a Stillpipe or Bypass Pipe

• Used for products with a dK less than 3.
• Used when vortex or extremely turbulent conditions exist.
• Provides optimum signal conditions on foaming materials.
• A horn antenna is preferred, but a rod antenna may also be used.

Stillpipe or Bypass Pipe requirements

• One continuous length of metallic pipe is preferred, without joints
If joints are unavoidable they must be machined to ± 0.25 mm (± 0.010") and must
have a welded connecting sleeve on the outside.
• Suitable pipe diameters:
• Bypass vent:
• Propagation factor.
Device orientation
Bypass Installation
vent
1)
Bad joints create reflections.
2)
To equalize pressure and keep the liquid level in the bypass constant with the liquid
level in the vessel.
7ML19985JR01 SITRANS LR200 (PROFIBUS PA) – INSTRUCTION MANUAL
50 mm (2") to 250 mm (10").
required at the upper end of the bypass
depends on pipe diameter. See Propagation Factor
(2.2.1.1.) on page 46 for a table.
Stillpipe Installation
align front
align front or back
or back of
of device with
device
stillpipe slots
with vents
optimum
diameter
80 mm (3")
1)
.
2)
slot
Page 157