Orientation In A Vessel With Obstructions - Siemens SITRANS LR200 7ML5422 Operating Instructions Manual

4.2.1.4

Orientation in a vessel with obstructions

Polarization reference point
For best results on a vessel with obstructions, or a stillpipe with openings, orient the front or
back of the device toward the obstructions. For an illustration, refer to Mounting on a stillpipe
or bypass pipe (Page 25).
①
②
③
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 (refer to Flanged horn dimensions (Page 158)).
● Suitable pipe diameters are between 50 mm (2") and 200 mm (8").
● One continuous length of metallic pipe is preferred, without joints
● Joints (if unavoidable) must be machined to ± 0.25 mm (± 0.010") and must have a
welded connecting sleeve on the outside.
● Bypass vent required at the upper end of the bypass
● Propagation factor depends on pipe diameter. For a table of pipe diameters, refer to
Propagation factor (2.8.3.) (Page 111).
Refer to Performance (Page 146).
1)
Bad joints create reflections.
2)
Required to equalize pressure and keep the liquid level in the bypass constant with the
3)
liquid level in the vessel.
SITRANS LR200 with mA/HART
Operating Instructions, 05/2019, A5E32337676-AE
Polarization axis
Polarization reference point
Display
Installing/mounting
, or when vortex or extremely
1)
.
2)
.
3)
4.2 Mounting
25