VEGA VEGAPULS 61 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - four-wire - Manual (Page 21)

21
4 Mounting
VEGAPULS 61 • 4 … 20 mA/HART - four-wire
36500-EN-121011
Make sure when planning your measuring site that the radar sensor
has a "clear view" to the measured product.
In case of existing vessel installations, a false echo storage should be
carried out during setup.
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. 18: Cover smooth profiles with deflectors
If there are agitators in the vessel, a false signal memory should be
carried out with the agitators in motion. This ensures that the interfer-
ing reflections from the agitators are saved with the blades in different
positions.
Fig. 19: 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.
Agitators
Foam generation