Patent US4160948A successfully refreshed from Google Patents.
US4160948A
Expired / Lapsed
US
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Monitoring effects of a liquid on metallic installations
Assignee: Solvay SA
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Filing: 1977-11-28
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Granted: 1979-07-10
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Expires: 1997-11-28
Abstract
Abstract The corrosive, erosive and/or encrusting effects of a liquid on metal surfaces are monitored by immersing a metallic probe into the liquid, and measuring simultaneously both the differential capacitance of the double layer between the probe and the liquid and the resistance between the probe and an auxiliary electrode, which are representative of the surface condition of the probe.
Inventors
- 👤 Daniel Tytgat
- 👤 Albert Degols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:17
CPC Classifications
G; G01; G01N; G01N17/00; G01N17/02; G01N27/00; G01N27/02; G01N27/22
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
92 words
Process for monitoring the corrosive, erosive and/or encrusting nature of a liquid with respect to a metallic installation, comprising: immersing a metallic probe into the liquid whereby a double layer is created at the interface between the probe and the liquid; immersing an auxiliary electrode into the liquid near the probe so that the auxiliary electrode is electrically insulated from the probe and measuring the differential capacitance of the double layer and the electrical resistance between the probe and the auxiliary electrode, which are representative of the surface condition of the probe.
Claim 2
Dependent Claim
92 words
Process for monitoring the corrosive, erosive and/or encrusting nature of a liquid with respect to a metallic installation, comprising: immersing a metallic probe into the liquid whereby a double layer is created at the interface between the probe and the liquid; immersing an auxiliary electrode into the liquid near the probe so that the auxiliary electrode is electrically insulated from the probe and measuring the differential capacitance of the double layer and the electrical resistance between the probe and the auxiliary electrode, which are representative of the surface condition of the probe.
Claim 3
Dependent Claim
29 words
Process as defined in claim 1 wherein said step of immersing is carried out by placing the probe near a surface of the installation, in contact with the liquid.
Claim 4
Dependent Claim
18 words
Process as defined in claim 2 wherein the probe is made of the same material as the installation.
Claim 5
Dependent Claim
26 words
Process as defined in claim 2 wherein the probe has substantially the same surface condition as the surface of the installation near which it is placed.
Claim 6
Dependent Claim
23 words
Process as defined in claim 2 wherein the probe is an element of the surface of the installation near which it is placed.
Claim 7
Dependent Claim
24 words
Process as defined in claim 5 wherein the probe is a removable element of the surface of the installation near which it is placed.
Claim 8
Dependent Claim
15 words
Process as defined in claim 1 wherein the installation is a pipeline for the liquid.
Claim 9
Dependent Claim
13 words
Process as defined in claim 1 wherein the installation is a heat exchanger.
Claim 10
Dependent Claim
15 words
Process as defined in claim 8 wherein the installation includes an evaporator for the liquid.
Claim 11
Dependent Claim
11 words
Process as defined in claim 1 wherein the liquid is water.
Claim 12
Dependent Claim
16 words
Process as defined in claim 1 wherein the liquid is an aqueous solution of sodium hydroxide.
Claim 13
Dependent Claim
84 words
Device for monitoring the corrosive, erosive and/or encrusting nature of a liquid with respect to a metallic installation, comprising: an electrochemical measuring cell constituted by a metallic probe and an auxiliary electrode arranged to contact the liquid to create a double layer at the interface between the probe and the liquid; and a component connected to said cell for measuring the differential capacitance of the double layer and the electrical resistance of said cell, which are representative of the surface condition of the probe.
Claim 14
Dependent Claim
84 words
Device for monitoring the corrosive, erosive and/or encrusting nature of a liquid with respect to a metallic installation, comprising: an electrochemical measuring cell constituted by a metallic probe and an auxiliary electrode arranged to contact the liquid to create a double layer at the interface between the probe and the liquid; and a component connected to said cell for measuring the differential capacitance of the double layer and the electrical resistance of said cell, which are representative of the surface condition of the probe.
Claim 15
Dependent Claim
18 words
Device as defined in claim 12 wherein said probe is made of the same metal as the installation.
Claim 16
Dependent Claim
25 words
Device as defined in claim 12 wherein at least one of said probe and said auxiliary electrode forms a removable wall element of the installation.
Claim 17
Dependent Claim
53 words
Device as defined in claim 12 wherein said auxiliary electrode forms a removable wall element of the installation and is provided with a slot, said probe is engaged in a removable manner in said slot of said auxiliary electrode; and said cell further comprises electrical insulation interposed between said probe and said electrode.
Claim 18
Dependent Claim
19 words
Device as defined in claim 12 wherein said auxiliary electrode is made of the same material as the installation.
Claim 19
Dependent Claim
13 words
Device as defined in claim 16 wherein the installation constitutes said auxiliary electrode.
Claim 20
Dependent Claim
33 words
Device as defined in claim 12 further comprising a signalling component connected to said measuring component for signalling a predetermined critical value of at least one of the above-mentioned capacitance and electrical resistance.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-09 | 1983-01-08 | 1983-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-09 | 1987-01-08 | 1987-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-09 | 1991-01-08 | 1991-07-10 | $7700.00 | Window Closed / Lapsed |