Accession Number : ADD004077

Title :   Apparatus for Determining Salinity of Fluids.

Descriptive Note : Patent,


Personal Author(s) : Doddington,Harold W ; Sheppard,Donald M

Report Date : 03 May 1977

Pagination or Media Count : 4

Abstract : This document describes an instrument for determining salt concentration in water by measuring electrical 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 he 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. (Author)

Descriptors :   *Patents, *Salinometers, Electrical conductivity, Probes, Salinity, High resolution

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE