Self alarming four double electrodes conductivity cell
AssigneeChemed Corporation
InventorHerbert Goldsmith
Life of this patent
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Abstract
A liquid conductivity cell utilizing the Kelvin four-electrode system, 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 the electrodes have fouled. The electrodes each have two flow passageways, whereby the liquid takes a "U" shaped path, and whereby the outer electrode closest to the liquid inlet and outlet fittings sinks all stray currents and the like to thereby permit interference free operation.
Claims10
A conductivity cell comprising a pair of voltage electrodes arranged within a pair of current electrodes, with all of said electrodes being arranged seriatim in the direction of flow through the cell, each of said electrodes comprises at least two flow openings, all four of said electrodes being arranged in said cell with thier openings in such relation to each other so as to thereby define two flow passageways in said cell, means to connect said two passageways into flow communication with each other to thereby define a single "U" shaped flow passageway through said cell, said single "U" shaped passageway thereby having a functional length equal to about twice the length of said cell, said single "U" shaped passageway passing through each of said electrodes at least twice via said at least two openings in each of said electrodes, means to permit flow into and out of said cell, and said flow permitting means being located in said cell in spaced relation to said passageway connecting means to said electrodes.
A conductivity cell comprising a pair of voltage electrodes arranged within a pair of current electrodes, with all of said electrodes being arranged seriatim in the direction of flow through the cell, each of said electrodes comprises at least two flow openings, all four of said electrodes being arranged in said cell with their openings in such relation to each other so as to thereby define two flow passageways in said cell, means to connect said two passageways into flow communication with each other, means to permit flow into and out of said cell, and said flow permitting means being located in said cell in spaced relation to said passageway connecting means and to said electrodes, and wherein said voltage electrodes are operated in a constant voltage mode with their voltage being held at a predetermined constant value, whereby the voltage of the power supplied to said current electrodes increases as said electrodes progressively foul, and using the supply voltage to operate said alarm means when said supply voltage exceeds a predetermined value, said last mentioned predetermined value corresponding to a predetermined condition of fouling of said electrodes.
Dependencies are inferred from the claim text.