Vega VEGAPULS 63 Operating Instructions Manual page 18

4 Mounting
Foam generation
Measurement in a surge
pipe
18
ing reflections from the agitators are saved with the blades in different
positions.
Fig. 13: Agitators
Through the action of filling, stirring and other processes in the vessel,
compact foams that considerably damp the emitted signals 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 ap-
plications.
When using a surge pipe in a vessel, influences from vessel installa-
tions and turbulences can be excluded. Under these prerequisites,
the measurement of products with low dielectric values (ε
≥ 1.6) is possible. In very adhesive products, measurement in a surge
pipe is not recommended.
VEGAPULS 63 • 4 ... 20 mA/HART two-wire
value
r