Vega VEGAPULS 64 - 4.5 Measurement setup - Flow

26
4 Mounting
VEGAPULS 64 • Two-wire 4 … 20 mA/HART
51141-EN-210219
Fig. 24: 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. 25: 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 medium surface.
If foams lead to measurement errors, you should use the biggest pos-
sible radar antennas or sensors with guided radar.
4.5 Measurement setup - Flow
In general, the following must be observed while mounting the device:
•
Mounting the sensor on the upstream or inlet side
•
Installationinthecentreoftheumeandverticaltotheliquid
surface
•
DistancetotheoverfalloriceorVenturiume
•
Min. distance to the max. height of damming for optimum accu-
racy: 250 mm (9.843 in)
3)
Agitators
Foam generation
Mounting
3)
At smaller distances the measuring accuracy is reduced, see "Technical
data".