Vega VEGAPULS 21 - Sensor orientation and interference mitigation; Flow measurement setup

15
4 Mounting
VEGAPULS 21 • Two-wire 4 … 20 mA/HART
58351-EN-191014
Fig.12:Coverat,large-areaproleswithdeectors
In liquids, direct the sensor as perpendicular as possible to the prod-
uct surface to achieve optimum measurement results.
Fig. 13: Alignment in liquids
If there are agitators in the vessel, a false signal suppression should
be carried out with the agitators in motion. This ensures that the
interferingreectionsfromtheagitatorsaresavedwiththebladesin
dierentpositions.
Fig. 14: Agitators
Throughtheactionoflling,stirringandotherprocessesinthevessel,
compact foams which considerably damp the emitted signals may
form on the product surface.
If foams lead to measurement errors, you should use the biggest pos-
sible radar antennas or sensors with guided radar.
4.3 Measurement setup - Flow
In general, the following must be observed while mounting the sensor:
Sensor orientation
Agitators
Foam generation