Self alarming five single electrodes conductivity cell
AssigneeChemed Corporation
InventorsHerbert Goldsmith, Richard M. Stilwell
Life of this patent
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Abstract
A cell for measuring the conductivity of liquids flowing through the cell utilizing the Kelvin four-electrode system, plus a guard electrode, and a circuit to operate an alarm when the operating electrodes have reached a predetermined state of fouling. Thus, the invention cell self alarms when it has been fouled to the point where operating results will thereafter be impaired.
Claims10
A method of operating alarm means to indicate a predetermined condition of fouling of the electrodes in a conductivity cell, said cell being of a type comprising a pair of voltage electrodes arranged within a pair of current electrodes, all of said electrodes being arranged seriatim in the direction of fluid flow through the cell, comprising the steps of utilizing the power provided in said current electrodes which increases as said electrodes progressively foul during use of the cell to activate said alarm means when said power equals a predetermined value, and selecting said predetermined value to correspond to said predetermined condition of fouling.
In a conductivity cell of a type comprising a pair of voltage electrodes arranged within a pair of current electrodes, a ground electrode arranged outboard of the current and voltage electrodes to bypass spurious currents to ground, and all of said electrodes being arranged seriatim in the direction of fluid flow through the cell, the improvement comprising alarm means, and an electrical circuit for utilizing the power provided to said current electrodes which increases as said electrodes progressively foul during use of the cell to operate said alarm means to indicate a predetermined condition of fouling of said electrodes.
The combination of cliam 5, an electrical circuit associated with said cell, one of said current electrodes being connected to a first electrical component in said circuit, said first component comprising ground means, and said one of said current electrodes being the electrode of said pair closest to said ground electrode.
Dependencies are inferred from the claim text.