US3878461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measurement of the amount of impurity in a fluid
Assignee: Safran Filtration Systems SAS
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Filing: 1970-07-30
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Granted: 1975-04-15
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Expires: 1990-07-30
Abstract
Abstract The invention relates to the measurement of the amount of impurity in a liquid. The invention is particularly directed to the measurement of the amount of free water in kerosene. Liquid is caused to flow through a filtration cell adapted to retain the impurity. The dielectric constant of the liquid is measured upstream and downstream of the filtration cell and the two measurements of dielectric constant are compared to give an indication of the level of said impurity in the liquid.
Inventors
- 👤 Robert Eugene Saint-Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:42
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223; G01N15/00; G01N15/06; G01N15/0606; G01N15/0618; G01N2015/0662
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
171 words
An apparatus for measuring the concentration in a liquid of an impurity the presence of which modifies the dielectric constant of the liquid, comprising a succession of cells including in order, a first measuring cell, a filtration cell and a second measuring cell, each measuring cell comprising a condenser and the apparatus having means for causing the liquid to pass between the condenser plates of the first measuring cell, then across the filtration cell and then between the condenser plates of the second measuring cell, said filtration cell comprising means for retaining the free water which is present in the liquid and which constitutes the impurity which is required to be measured, a comparator device electrically connected to the condensers of the measuring cells, said comparator producing a signal representing the difference between the dielectric constants of the liquid passing through the first measuring cell and of the liquid passing through the second measuring cell, the said signal being transmitted to an apparatus adapted to indicate the value of the signal.
Claim 2
Independent Claim
171 words
An apparatus for measuring the concentration in a liquid of an impurity the presence of which modifies the dielectric constant of the liquid, comprising a succession of cells including in order, a first measuring cell, a filtration cell and a second measuring cell, each measuring cell comprising a condenser and the apparatus having means for causing the liquid to pass between the condenser plates of the first measuring cell, then across the filtration cell and then between the condenser plates of the second measuring cell, said filtration cell comprising means for retaining the free water which is present in the liquid and which constitutes the impurity which is required to be measured, a comparator device electrically connected to the condensers of the measuring cells, said comparator producing a signal representing the difference between the dielectric constants of the liquid passing through the first measuring cell and of the liquid passing through the second measuring cell, the said signal being transmitted to an apparatus adapted to indicate the value of the signal.
Claim 3
Dependent Claim
21 words
An apparatus according to claim 1 comprising detecting means connected to the filtration cell to verify satisfactory functioning of the cell.
Claim 4
Dependent Claim
42 words
An apparatus according to claim 2, in which the three cells are arranged in a box provided with an inlet for liquid connected to the first measuring cell and an outlet for liquid connected to the outlet of the second measuring cell.
Claim 5
Dependent Claim
21 words
Apparatus according to claim 3, in which the measuring cells have a capacitance of between 20 and 100 picofarads in air.
Claim 6
Dependent Claim
22 words
Apparatus according to claim 4, in which the said liquid is kerosene, the said impurity being free water present in the kerosene.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |