Electrical measuring assembly
AssigneeTesto SE & Co. KGaA
InventorsSiegfried Stallmann, Oliver Wiech
Life of this patent
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Abstract
In an electrical measuring assembly (1), in which an inner electrode (2) and an outer electrode (3), which form a measuring chamber (4) therebetween for a capacitive examination of a liquid flowing past, are formed from a food-safe stainless steel, the inner electrode (2) is supported at the axial ends (6, 7) thereof on the outer electrode (3) by insulating elements (10, 11), which are produced from a ceramic material or plastic material that can be machined and/or that has a permittivity that is temperature-independent in a working range and/or that is free of pores and/or does not absorb water.
Claims19
An electrical measuring assembly (1) for capacitive measurement of a liquid, the electrical measuring assembly comprising:
- an outer electrode (3),
- an inner electrode (2) arranged concentrically to the outer electrode (3), such that the outer electrode encloses the inner electrode forming a measuring chamber (4) between the inner electrode (2) and the outer electrode (3),
- the inner electrode (2) is secured to the outer electrode (3) at axial ends of the measuring chamber (4),
- at least one inlet opening (8) to the measuring chamber (4) and at least one discharge opening (9) from the measuring chamber (4) are provided in the outer electrode (3),
- the outer electrode (3) and the inner electrode (2) are formed of stainless steel, and
- insulating elements (10, 11) that retain the inner electrode (2) at the axial ends (6, 7), the insulating elements (10, 11) are formed of a food-safe material, comprising a glass ceramic or a plastic, that is at least one of
- a) a material having a permittivity that, over a temperature range from 20° C. to 200° C., varies by a maximum of 30%,
- b) a pore-free material,
- c) a material which absorbs no water, or
- d) a chip-machineable material.
An electrical measuring assembly (1) for capacitive measurement of a liquid, the electrical measuring assembly comprising:
- an outer electrode (3),
- an inner electrode (2) arranged concentrically to the outer electrode (3), such that the outer electrode encloses the inner electrode forming a measuring chamber (4) between the inner electrode (2) and the outer electrode (3),
- the inner electrode (2) is secured to the outer electrode (3) at axial ends of the measuring chamber (4),
- at least one inlet opening (8) to the measuring chamber (4) and at least one discharge opening (9) from the measuring chamber (4) are provided in the outer electrode (3),
- the inlet opening (8) and the discharge opening (9) are respectively configured as radially open, and an internal clearance (19) of the inlet opening (8) and the discharge opening (9), transversely to a longitudinal direction (17), is smaller than an internal diameter (20) of the measuring chamber (4).
Dependencies are inferred from the claim text.