VEGA VEGASON 61 Foundation Fieldbus - Manual (Page 14)

14
4 Mounting
VEGASON 61 • Foundation Fieldbus
28790-EN-130417
~200
~400x40
0
45°
Fig. 10: Beam deflector
The ultrasonic sensor should be installed at a location where no
installations cross the ultrasonic beam.
Vessel installations such as for example, ladders, limit switches, heat-
ing 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.
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 or plastic baffles above the installations
scatter the ultrasonic signals and avoid direct false echoes.
α
α
α
α
α
α
Fig. 11: 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.
Vessel installations
Agitators