Vega VEGAPULS 63 Operating Instructions Manual page 18

Radar sensor for continuous level measurement of aggressive liquids or with hygienic requirements 20 ma/hart - four-wire

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4 Mounting

Foam generation

Measurement in the

standpipe (surge or by-

pass tube)

Fig. 10: 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 lead to measurement errors, you should use the

biggest possible radar antennas and low frequency radar

sensors (C-band).

As an alternative, sensors with guided microwave can be

used. These are unaﬀected by foam generation and are best

suited for such applications.

By using a standpipe, the inﬂuence of vessel installations and

turbulence can be excluded. Under these prerequisites, the

measurement of products with low dielectric values (from DK

value 1.6) is possible.

Surge or bypass tubes must extend all the way down to the

requested min. level, as measurement is only possible within

the tube.

Surge pipe

Make sure you provide the necessary upper vent hole in the

surge pipe. The hole must be aligned so that it and the

polarisation marking on the sensor are in the same plane (see

illustration: "Pipe antenna system in a tank").

VEGAPULS 63 • 4 ... 20 mA/HART - four-wire

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