Vega VEGAPULS 62 Operating Instructions Manual page 19

4 Mounting
Foam generation
Measurement in a surge
pipe
18
Fig. 12: Agitators
Through the action of filling, stirring and other processes in the vessel,
compact foams that damp the emitted signals considerably may form
on the product surface.
If foams are causing measurement errors, the biggest possible radar
antennas, the electronics with increased sensitivity or low frequency
radar sensors (C band) should be used.
As an alternative, sensors with guided microwave can be used. These
are unaffected by foam generation and are best suited for such
applications.
When using a surge pipe in a vessel, influences from vessel
installations and turbulences can be excluded. Under these prereq-
uisites, the measurement of products with low dielectric values (ε
value ≥ 1.6) is possible. In very adhesive products, measurement in a
surge pipe is not recommended.
VEGAPULS 62 • 4 ... 20 mA/HART two-wire
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