Apparatus for determining salinity of fluids

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture

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Details

73170A, 324 30B, G01N 2708

Patent

active

040206777

ABSTRACT:
An instrument for determining salt concentration in water by measuring elrical conductivity. A probe of electrical insulating material has one electrode mounted on the exterior surface of the probe and a second electrode is mounted in a cavity in the probe. A horizontal slit is provided at one end of the probe and a small vertical hole connects the horizontal slit with the cavity to provide a fluid passageway. A sinusoidal current excitation source is provided to energize the probe and the electrical current density between the two electrodes is small except in the vertical hole where the current density becomes very large. The resistance between the electrodes at any instant is governed by the resistance of the fluid in the vertical hole. The resistance of the fluid is measured by processing the voltage which exists between the two electrodes of the probe through a differential amplifier, rectifier, filter and output amplifier arrangement to provide a voltage output which is inversely proportional to the salinity of the fluid being tested.

REFERENCES:
patent: 2939070 (1960-05-01), Rosenthal
patent: 3181058 (1965-04-01), Gulbrandsen
patent: 3263224 (1966-07-01), Berman et al.
patent: 3748899 (1973-07-01), Gregg et al.
patent: 3774104 (1973-11-01), Andersen
patent: 3963979 (1976-06-01), Dauphinee

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