US 4,072,892 A · Electrolytic measurement system with an inner post and an outer cylindrical shield fluid boundary

Abstract

An electrolytic measurement system incorporating a probe for the measurement of the conductivity of fluids such as sewage and other industrial effluents. The probe has a smooth surface to passage of the fluid with flush-mounted electrodes arranged serially along the passage. The passage is formed within material that is an electrical insulator and is surrounded by a metallic shield symmetrically positioned with respect to the ends of the serially arranged electrodes. An electric potential is impressed between the outer electrodes and the shield, the latter being grounded, while an inner electrode is used for the measurement of electric current flowing through the fluid from the outer electrodes to the inner electrode. Sensing electrodes positioned between the inner and outer electrodes are utilized in a feedback circuit for sensing the electric field to vary the magnitude of the impressed voltage to maintain a constant magnitude of impressed field independently of the presence of electrochemical byproducts upon the electrode surfaces.

Claims4

Dependent claims

An electrolytic measurement system comprising:

a passage for fluid having a boundary formed of an inner post and an outer cylindrical shield;
a plurality of electrodes flush-mounted along the surface of said post within said boundary for making contact with said fluid, said electrodes being positioned in a serial arrangement along an axis of said passage;
means for electrically energizing a plurality of outer ones of said electrodes which are symmetrically positioned about a center of said arrangement;
means including pairs of said electrodes symmetically positioned between said outer electrodes and an inner one of said electrodes for signaling the presence of an electric current flowing between said outer electrodes and said inner electrode, said signaling means being coupled to said energizing means for maintaining a constant magnitude of electric field between said outer electrodes and said inner electrode independently of electrode resistance of said inner and outer electrodes;
means coupled between said outer electrodes and said inner electrode for measuring electric current flow between said outer electrodes and said inner electrode.

2 more elements

Dependencies are inferred from the claim text.

Electrolytic measurement system with an inner post and an outer cylindrical shield fluid boundary

Life of this patent

Electrolytic measurement system with an inner post and an outer cylindrical shield fluid boundary

Life of this patent

Abstract

Claims4