Balluff BMD 1H Serie Manual De Instrucciones página 91

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Prerequisites for inter-
face measurement
h2
h1
Fig. 3: Interface measurement
d1 Distance to the interface
d2 Distance to the level
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 or the actual distance
to the interface must be known (input required). Min. dielectric
constant: 1.6.
The composition of the upper medium must be stable, no varying
products or mixtures
within the medium
Min. thickness of the upper medium 50 mm (1.97 in)
Clear separation from the lower medium, emulsion phase or detri-
tus layer max. 50 mm (1.97 in)
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 phase does not
always exist (d2 = 0)
d2
L3
L2
TS
L1
3 Product description
1
d1
9

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