VEGA VEGASON 64 4 … 20 mA_HART four-wire - Manual (Page 20)

V essel installations such as for example, ladders, limit switches,
heating spirals, struts etc. can cause false echoes that interfere with
the useful echo. Make sure when planning your measuring site that the
ultrasonic signals have a "clear view" to the measured product.
I n case of existing vessel installations, a false echo storage should be
carried out during setup.
I
f large vessel installations such as struts or supports cause false
echoes, these can be attenuated through supplementary measures.
S
mall, inclined sheet metal or plastic baffles above the installations
scatter the ultrasonic signals and avoid direct false echoes.
α
α
α
α
α
α
Fig. 13: Cover smooth profiles with deflectors
I f there are agitators in the vessel, a false echo storage 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. 14: Agitators
Agitators
20 VEGASON 64 • 4 … 20 mA/HART four-wire
4 M ounting
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