US3924175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
D.C. system for conductivity measurements
Assignee: Baker Petrolite LLC
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Filing: 1974-02-28
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Granted: 1975-12-02
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Expires: 1994-02-28
Abstract
Abstract A d.c. system for measurement of conductivity of an electrolyte. Four side-by-side metallic electrodes serve as auxiliary electrodes for passing current through the electrolyte and reference electrodes for monitoring polarization potential increment. Conductors form separate electrical circuits with the electrodes. A current source passes a measurable amount of direct current between the auxiliary electrodes for inducing a change in polarization potential between the reference electrodes which incremental change in polarization potential is measured. A comparator controls the current source to provide the certain measurable amount of direct current. A readout device senses the direct current passed between the auxiliary electrodes, and the certain measurable amount of direct current is proportional to the conductivity of the electrolyte.
Inventors
- 👤 Homer M Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:47
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
211 words
A d.c. system for measurement of conductivity of an electrolyte comprising: a. four metallic electrodes immersible in the electrolyte, said electrodes disposed in a side-by-side alignment forming exterior and interior electrode pairs, one of the exterior or interior electrodes serving as reference electrodes for monitoring said electrodes'' polarization potential, and respectively, the other of the interior or exterior electrodes providing auxiliary electrodes for passing current through the electrolyte for creating the polarization potential; b. conductor means forming separate electrical circuits with said electrodes; c. current source means for passing a measurable amount of direct current between said auxiliary electrodes for inducing an incremental change of predetermined magnitude in electrode potential between said reference electrodes; d. potential measurement means connected to said reference electrodes for measurement of the incremental change in polarization potential therebetween; e. comparator means associated with said potential measurement means for controlling the current source means whereby a certain measurable amount of direct current passed between the auxiliary electrodes induces an incremental change of a predetermined magnitude between about 5 and 50 millivolts in electrode potential between said reference electrodes; and f. readout means sensing the direct current passed between said auxiliary electrodes whereby the certain measurable amount of direct current is proportional to the conductivity of the electrolyte.
Claim 2
Dependent Claim
211 words
A d.c. system for measurement of conductivity of an electrolyte comprising: a. four metallic electrodes immersible in the electrolyte, said electrodes disposed in a side-by-side alignment forming exterior and interior electrode pairs, one of the exterior or interior electrodes serving as reference electrodes for monitoring said electrodes'' polarization potential, and respectively, the other of the interior or exterior electrodes providing auxiliary electrodes for passing current through the electrolyte for creating the polarization potential; b. conductor means forming separate electrical circuits with said electrodes; c. current source means for passing a measurable amount of direct current between said auxiliary electrodes for inducing an incremental change of predetermined magnitude in electrode potential between said reference electrodes; d. potential measurement means connected to said reference electrodes for measurement of the incremental change in polarization potential therebetween; e. comparator means associated with said potential measurement means for controlling the current source means whereby a certain measurable amount of direct current passed between the auxiliary electrodes induces an incremental change of a predetermined magnitude between about 5 and 50 millivolts in electrode potential between said reference electrodes; and f. readout means sensing the direct current passed between said auxiliary electrodes whereby the certain measurable amount of direct current is proportional to the conductivity of the electrolyte.
Claim 3
Dependent Claim
12 words
The system of claim 1 wherein said incremental change is 10 millivolts.
Claim 4
Dependent Claim
16 words
The system of claim 1 wherein said electrodes are elongated metal rods of substantially identical dimensions.
Claim 5
Dependent Claim
20 words
The system of claim 1 wherein said exterior electrodes serve as reference electrodes and said interior electrodes provide auxiliary electrodes.
Claim 6
Dependent Claim
39 words
The system of claim 1 wherein said electrodes are elongated members oriented vertically in a plane, and each said reference electrode is spaced from the adjacent auxiliary electrode a distance not greater than the spacing between the auxiliary electrodes.
Claim 7
Dependent Claim
24 words
The system of claim 5 wherein the auxiliary electrodes are spaced apart a distance at least twice the distance between adjacent reference and auxiliary-electrodes.
Claim 8
Dependent Claim
47 words
The system of claim 6 wherein said electrodes are disposed within a cylindrical passageway formed in an insulator and positioned transversely to the longitudinal axis of said cylindrical passageway whereby said insulator provides a flux channel delimiting the current paths in the electrolyte residing between said electrodes.
Claim 9
Dependent Claim
63 words
The system of claim 7 wherein the electrodes confined in said flux channel are dimensioned to provide a 10 millivolt incremental change in polarization potential between said reference electrodes when 1 microampere of current passes between said auxiliary electrodes whereby the readout means reflects about 1,000 micromhos in conductivity in the electrolyte for each 1 microampere of current passed between said auxiliary electrodes.
Claim 10
Dependent Claim
44 words
The system of claim 8 wherein the distance between auxiliary electrodes and the cross-sectional area of the flux channel are dimensioned to provide the readout means with a calibration of 1, 000 micromhos for each one microampere of current passed between said auxiliary electrodes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |