Hydrostatic Interface Measuring Device

1 - 9 . (canceled)

10 . A hydrostatic interface measuring device for ascertaining the height of an interface between a first phase of a medium with a first density and a second phase of a medium with a second density, comprising:

a first pressure registering point for registering a first pressure of a medium at a first height;

a second pressure registering point for registering a second pressure of the medium at a second height, and

an evaluation apparatus, wherein:

a height separation between the first pressure registering point and the second pressure registering point is known;

the second height lies above a height range, in which the interface is expected; and

said evaluation apparatus is adapted, based on the registered pressures, respectively a pressure difference between the registered pressures, as well as based on a first density value and a second density value, respectively a density difference between the density values, to determine a height of an interface.

11 . A hydrostatic interface measuring device as claimed in claim 10 , wherein:

the first pressure registering point has a first pressure measuring transducer for measuring a first pressure; and

the second pressure registering point has a second pressure measuring transducer for measuring the second pressure.

12 . The hydrostatic interface measuring device as claimed in claim 11 , wherein:

the measuring- and evaluation apparatus furthermore is provided, based on at least one pressure measured value, to determine a fill level of the medium.

13 . The hydrostatic interface measuring device as claimed in claim 10 , wherein:

said evaluation apparatus has a data memory; and

the first density value and/or the second density value, respectively a density difference between the density values, is/are furnished in the data memory.

14 . The hydrostatic interface measuring device as claimed in claim 10 , further comprising:

at least one measuring arrangement for ascertaining at least one of the density values.

15 . The hydrostatic interface measuring device as claimed in claim 10 , wherein:

the measuring arrangement includes for ascertaining at least one of the density values at least one vibronic densimeter, which is arranged especially neighboring a pressure registering point.

16 . The hydrostatic interface measuring device as claimed in claim 10 , wherein:

the measuring arrangement includes for ascertaining the first density value a third pressure registering point, which is arranged vertically spaced from the first pressure registering point at a third height; and

said evaluation apparatus is adapted to ascertain the first density measured value based on a difference of the hydrostatic pressures at the first and third height.

17 . The hydrostatic interface measuring device as claimed in claim 10 , wherein:

the measuring arrangement includes for ascertaining the first density value a fourth pressure registering point, which is arranged vertically spaced from the second pressure registering point at a fourth height; and

said evaluation apparatus is adapted to ascertain the second density measured value based on a difference of the hydrostatic pressures at the second and fourth height.

18 . The hydrostatic interface measuring device as claimed in claim 10 , wherein:

the height of the interface is ascertained based on the following equation or an equivalent equation:

H

i

=

H

2

-

Δ





p

0



(

ρ

1

)

-

Δ





p

Δρ

·

g

,

wherein Δp is the measured difference between the first pressure and the second pressure,

wherein Δp 0 (ρ 1 ) corresponds to a difference between the first pressure and the second pressure for the case, in which the height of the interface H g amounts to zero, and

wherein Δρ is the difference between the first density and the second density.