VEGA VEGAPULS 81 - Manual (Page 45)

VEGAPULS 64 and 81 45
Mounting and installation: False echoes
Heavy product movements
Heavy turbulences in the vessel, e.g. by
strong stirrers or strong chemical reactions
aggravate the measurement. A bypass pipe of
sufficient size, provided that there is not build-
up in the measuring pipe, always ensures a
reliable measurement even with heavy
turbulences in the vessel.
Products which cause slight build-up can be
measured by using a bypass pipe with 100
mm nominal width or more. In a bypass pipe of
this size, slight build-up does not cause prob-
lems.
Build-up
If the radar sensor is mounted too close to the
vessel wall, build-up on the vessel walls will
cause false echoes. Position the radar sensor
at a sufficient distance to the vessel wall.
Heavy product movements
Inflowing product
Do not mount the instrument above or in the
filling stream. Ensure that they detect the
product surface and not the inflowing material.
Build-up
Inflowing solid
Inflowing liquid
Correct Wrong
Correct Wrong
Correct Wrong
Correct Wrong
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