Vega VEGADIF 65 4 … 20 mA Bedienungsanleitung PDF herunterladen (Seite 27)

4Mounting

VEGADIF 65 • 4 … 20 mA

36236-EN-130417

–

min.

max.

+ –

Fig. 26: Measurement setup in closed vessel with superimposed steam

1 Condensate vessel

2 Blocking valve

3 Separator

4 Drain valve

5 VEGADIF 65

4.6 Measurement setup density and interface

Inavesselwithvaryinglevelandhomogeneousdensitydistribution,

densitymeasurementwithadierentialpressuretransmittercanbe

realized.Theconnectiontothevesselismadeviaachemicalsealon

twomeasuringpoints.Toreachahighaccuracy,thedistancebetween

these points must be as big as possible. The density measurement is

onlyensuredwithalevelabovetheuppermeasuringpoint.Ifthelevel

dropsbelowtheuppermeasuringpoint,thedensitymeasurementis

interrupted.

Thisdensitymeasurementfunctionswithopenbutalsowithclosed

vessels.Makesurethatsmalldensitychangescauseonlysmall

changestothemeasureddierentialpressure.Selectasuitable

measuring range.

The density measurement is carried out in the mode level measure-

ment.

1. MountVEGADIF65belowthelowerchemicalseal

2. The ambient temperature should be the same for both capillaries

Example for a density measurement:

Distancebetweenthetwomeasurementpoints:0.3m

Min.density:1000kg/m³

Max.density:1200kg/m³

Measureddierentialpressure:Δp=ρ•g•h

Themin.adjustmentiscarriedoutforthedierentialpressuremeas-

ured at density 1.0:

Δp=ρ•g•h

=1000kg/m³•9.81m/s

• 0,3 m

=2943Pa=29.43mbar

Density measurement

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Vega VEGADIF 65 4 … 20 mA Bedienungsanleitung Seite 27