Vega VEGAFLEX 83 Modbus and Levelmaster protocol PFA in Instrukcja Użytkownika Pobierz pdf (Strona 13)

3 Product description

VEGAFLEX 83 • Modbus and Levelmaster protocol

41838-EN-130314

Fig. 7: Interface measurement

1 Sensorreferenceplane(sealsurfaceoftheprocesstting)

d1 Distancetotheinterface(HARTvalue1)

d2 Distancetothelevel(HARTvalue3)

TSThicknessoftheuppermedium(d1-d2)

h1 Height - Interface

h2 Height - Level

L1 Lower medium

L2 Upper medium

L3 Gas phase

Upper medium (L2)

•

The upper medium must not be conductive

•

The dielectric constant of the upper medium must be known (input

required). Min. dielectric constant: rod version 1.6. You can nd a

list of dielectric constants on our home page: www.vega.com

•

The composition of the upper medium must be stable, no varying

products or mixtures

•

The upper medium must be homogeneous, no stratications

within the medium

•

Min. thickness of the upper medium 50 mm (1.97 in)

•

Clear separation from the lower medium, no emulsion phase, no

mull layer

•

If possible, no foam on the surface

Lower medium (L1)

•

The dielectric constant must be 10 higher than the dielectric

constant of the upper medium, preferably electrically conductive.

Example: upper medium dielectric constant 2, lower medium at

least dielectric constant 12.

Gas phase (L3)

•

Air or gas mixture

•

Gas phase - dependent on the application, gas pahse does not

always exist (d2 = 0)

The instrument is always preset to the application "Level measure-

ment".

Prerequisites for inter-

face measurement

Output signal

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 95 96

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Vega VEGAFLEX 83 Modbus and Levelmaster protocol PFA in Instrukcja Użytkownika Strona 13

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