US4028197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for monitoring available chlorine in swimming pools
Assignee: Olin Corp
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Filing: 1975-12-31
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Granted: 1977-06-07
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Expires: 1995-12-31
Abstract
Abstract A method for the measurement of amounts of free available halogen in solution which is independent of the pH has been developed. The method comprises providing a sensing electrode having a porous conductive component and a reference electrode in a measuring zone, and connecting a potential measuring means between the sensing electrode and the reference electrode. An aqueous solution containing an available halogen is introduced into the measuring zone to contact the sensing electrode and the reference electrode. A pH control solution is passed through at least a portion of the porous conductive component. The free available halogen concentration is measured and indicated on the potential measuring means.
Inventors
- 👤 Italo A. Capuano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:06
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/4166; G01N27/4168
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
167 words
A method for measuring the available halogen concentration of an aqueous solution in the absence of an applied potential comprising: 1. providing a sensing electrode having a porous conductive component and a reference electrode in a measuring zone, 2. connecting a potential measuring means between said sensing electrode and said reference electrode, 3. introducing said aqueous solution containng said available halogen into said measuring zone, 4. contacting said porous conductive component of said sensing electrode and said reference electrode with said aqueous solution containing available halogen, 5. passing a pH control solution through at least a portion of said porous conductive component of said sensing electrode, said pH control solution cleansing said portion of said porous conductive component and said pH control solution controlling the pH at said surface of said portion of said porous conductive component contacting said aqueous solution containing said available halogen, 6. measuring said available halogen concentration in said aqueous solution, and 7. indicating said available halogen concentration on said potential measuring means.
Claim 2
Independent Claim
167 words
A method for measuring the available halogen concentration of an aqueous solution in the absence of an applied potential comprising: 1. providing a sensing electrode having a porous conductive component and a reference electrode in a measuring zone, 2. connecting a potential measuring means between said sensing electrode and said reference electrode, 3. introducing said aqueous solution containng said available halogen into said measuring zone, 4. contacting said porous conductive component of said sensing electrode and said reference electrode with said aqueous solution containing available halogen, 5. passing a pH control solution through at least a portion of said porous conductive component of said sensing electrode, said pH control solution cleansing said portion of said porous conductive component and said pH control solution controlling the pH at said surface of said portion of said porous conductive component contacting said aqueous solution containing said available halogen, 6. measuring said available halogen concentration in said aqueous solution, and 7. indicating said available halogen concentration on said potential measuring means.
Claim 3
Dependent Claim
21 words
The method of claim 1 in which said available halogen is selected from a group consisting of chlorine, bromine, and iodine.
Claim 4
Dependent Claim
11 words
The method of claim 2 wherein said available halogen is chlorine.
Claim 5
Dependent Claim
45 words
The method of claim 3 in which said aqueous solution is a solution of a compound containing said available chlorine selected from a group consisting of alkali metal hypochlorites, alkaline earth metal hypochlorites, alkali metal chloroisocyanurates, alkaline earth metal chloroisocyanurates, hypochlorous acid and chloroisocyanuric acids.
Claim 6
Dependent Claim
15 words
The method of claim 4 in which said compound is an alkaline earth metal hypochlorite.
Claim 7
Dependent Claim
15 words
The method of claim 5 in which said alkaline earth metal hypochlorite is calcium hypochlorite.
Claim 8
Dependent Claim
13 words
The method of claim 4 in which said aqueous solution contains hypochlorous acid.
Claim 9
Dependent Claim
26 words
The method of claim 4 in which said pH control solution is hydrochloric acid containing from about 0.5 to about 6 percent by weight of HCl.
Claim 10
Dependent Claim
34 words
The method of claim 8 in which the rate of flow of said pH control solution thru said portions of said porous conductive component is from about 0.01 to about 0.1 ml. per minute.
Claim 11
Dependent Claim
13 words
The method of claim 9 in which said porous conductive component is graphite.
Claim 12
Dependent Claim
25 words
The method of claim 4 in which said hydrochloric acid contains from about 0.001 to about 10 percent by weight of an alkali metal chloride.
Claim 13
Dependent Claim
18 words
The method of claim 2 in which said aqueous solution containing said available halogen is swimming pool water.
Claim 14
Dependent Claim
25 words
The method of claim 2 in which said available halogen concentration in said aqueous solution is from about 0.1 to about 20 parts per million.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |