VEGA VEGASON 64 Foundation Fieldbus - Manual (Page 21)

Large material heaps are best measured with several instruments,
which can be mounted on e.g. traverse cranes. For this type of
application it is advantageous to orient the sensor perpendicular to the
bulk solid surface.
Fig. 15: Transducers on traverse crane
Do not mount the instruments in or above the filling stream. Make sure
that you detect the product surface, not the inflowing product.
Fig. 16: Inflowing medium
Through the action of filling, stirring and other processes in the vessel,
dense foams which considerably damp the emitted signals may form
on the product surface.
If foams are causing measurement errors, the sensor should be used
in a standpipe or, alternatively, the more suitable guided radar sensors
(TDR) should be used.
Guided radar is unaffected by foam generation and is particularly
suitable for such applications.
Material heaps
Inflowing medium
Foam
VEGASON 64 • Foundation Fieldbus 21
4 Mounting
28793
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EN
-081127