Patent ID: 11953487
Assignee: ECOWATER SYSTEMS LLC
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 8:
9. An apparatus for determining hardness in water, said apparatus comprising:
a first sodium ISE sensor coupled with a first reference electrode, said first sodium ISE sensor configured to receive hard water;
a second sodium ISE sensor coupled with a second reference electrode, said second sodium ISE sensor in electrical communication with said first sodium ISE sensor, and configured to receive soft water, wherein said second reference electrode is in contact with a KCl solution and bound by a second dialysis membrane;
said first and second reference electrodes having a salt bridge therebetween; and
at least one drain to receive outflow from effluent fluid from said first and second sodium ISE sensors;
wherein said first sodium ISE sensor includes a chamber between two membranes where fluid can be introduced for measurement and dispensed, and such that there is electrical continuity from a working electrode, through a conductive solution, an ionophore membrane, said fluid, the second dialysis membrane, said KCl solution, and to said second reference electrode.