VEGA VEGAPULS 66 (≥ 2.0.0 - ≥ 4.0.0) enamel 4 … 20 mA_HART - two-wire User Manual

Page 17

4 Mounting

VEGAPULS 66 enamel • 4 … 20 mA/HART - two-wire

36527-EN-121011

If large vessel installations such as struts or supports cause false

echoes, these can be attenuated through supplementary measures.

Small, inclined sheet metal baffles above the installations scatter the

radar signals and prevent direct interfering reflections.

Fig. 11: Cover smooth profiles with deflectors

If there are agitators in the vessel, a false signal suppression should

be carried out with the agitators in motion. This ensures that the

interfering reflections from the agitators are saved with the blades in

different positions.

Fig. 12: Agitators

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 biggest possible radar

antenna 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

value

≥ 1.6) is possible. In very adhesive products, measurement in a surge

pipe is not recommended.

Agitators

Foam generation

Measurement in a surge

pipe