VEGA VEGASON 61 Foundation Fieldbus User Manual

Page 14

4 Mounting

VEGASON 61 • Foundation Fieldbus

28790-EN-130417

~200

~400x40

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.

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