Patent US3880722A successfully refreshed from Google Patents.
US3880722A
Expired / Lapsed
US
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Potentiometric CO detector
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1973-01-02
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Granted: 1975-04-29
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Expires: 1993-01-02
Abstract
Abstract An instrument for the detection and measurement of the carbon monoxide content of gases, particularly in automobile exhaust, wherein CO is reacted with water to form CO2 and hydrogen ions and producing a voltage change which is proportional to the CO content of the gas under suitable conditions. The reaction takes place in an aqueous solution and employs suitable oxidizing agents amd a palladium salt catalyst.
Inventors
- 👤 Morton Beltzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:24
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/4162; Y; Y10; Y10T; Y10T436/00; Y10T436/20; Y10T436/204998; Y10T436/205831
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
A METHOD OF MEASURING THE CO CONCENTRATION OF A GAS COMPRISING: A. ADMITTING GAS WHICH MAY CONTAIN CO TO A FIRST AQUEOUS SOLUTION CONTAINING HYDROGEN CHLORIDE AND AT LEAST A SINGLE OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF FERROUS AND FERRIC IONS, QUIONES, AND CUPRIC IONS AND A PALLADIUM CHLORIDE CATALYST IN AMOUNTS SUFFICIENT FOR PRODUCING A VOLTAGE WHICH INCREASES LINEARLY WITH TIME WHEN CO REACTS WITH SAID SOLUTION. B. MEASURING THE VOLTAGE DIFFERENCE AT A TIME, T, FOLLOWING REACTION OF CO WITH SOLUTION BETWEEN SAID FIRST SOLUTION AND A SECOND AQUEOUS SOLUTION COMPRISING THE SAME OXIDIZING AGENT AS SAID FIRST SOLUTION AND NOT IN CONTACT WITH SAID CO-CONTAINING GAS WHEREUPON THE MEASURED VOLTAGE DIFFERENCE, $ E, IS LINEARLY DEPENDENT UPON THE CONCENTRATION OF CO IN SAID GAS AND THE TIME EXPOSURE OF SAID GAS TO SAID FIRST SOLUTION IN ACCORDANCE WITH THE FOLLOWING EQUATION: $ E=K (PCO)T WHERE: K=A2/B K2, AND WHEREIN: (PCO) = THE PARTIAL PRESSURE OF CO IN SAID GAS, T = THE TIME ELAPSED FROM ZERO REFERENCE AT WHICH THE VOLTAGE MEASUREMENT IS MADE,
Claim 2
Independent Claim
179 words
A METHOD OF MEASURING THE CO CONCENTRATION OF A GAS COMPRISING: A. ADMITTING GAS WHICH MAY CONTAIN CO TO A FIRST AQUEOUS SOLUTION CONTAINING HYDROGEN CHLORIDE AND AT LEAST A SINGLE OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF FERROUS AND FERRIC IONS, QUIONES, AND CUPRIC IONS AND A PALLADIUM CHLORIDE CATALYST IN AMOUNTS SUFFICIENT FOR PRODUCING A VOLTAGE WHICH INCREASES LINEARLY WITH TIME WHEN CO REACTS WITH SAID SOLUTION. B. MEASURING THE VOLTAGE DIFFERENCE AT A TIME, T, FOLLOWING REACTION OF CO WITH SOLUTION BETWEEN SAID FIRST SOLUTION AND A SECOND AQUEOUS SOLUTION COMPRISING THE SAME OXIDIZING AGENT AS SAID FIRST SOLUTION AND NOT IN CONTACT WITH SAID CO-CONTAINING GAS WHEREUPON THE MEASURED VOLTAGE DIFFERENCE, $ E, IS LINEARLY DEPENDENT UPON THE CONCENTRATION OF CO IN SAID GAS AND THE TIME EXPOSURE OF SAID GAS TO SAID FIRST SOLUTION IN ACCORDANCE WITH THE FOLLOWING EQUATION: $ E=K (PCO)T WHERE: K=A2/B K2, AND WHEREIN: (PCO) = THE PARTIAL PRESSURE OF CO IN SAID GAS, T = THE TIME ELAPSED FROM ZERO REFERENCE AT WHICH THE VOLTAGE MEASUREMENT IS MADE,
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said first and second solutions initially have the same composition.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the voltage sensitivity is adjusted by varying the concentration ratio of said oxidizing agent in its oxidized to reduced form.
Claim 5
Dependent Claim
32 words
The method of claim 1 wherein CO-containing gas is admitted until a maximum voltage change has been achieved, thereby measuring the total CO content of the gas passed through the first solution.
Claim 6
Independent Claim
111 words
A method for measuring the CO concentration of exhaust gas from an internal combustion engine comprising: a. admitting said exhaust gas to a first aqueous solution containing about 1.5 M HCl, 0.01 M FeCl3, 0.001 M FeCl2 and about 0.1 M PdCl2 catalyst; b. measuring the voltage difference between said first aqueous solution exposed to said exhaust gas and a second aqueous solution of the same composition as said first solution, said second solution not being exposed to said CO-containing gas; c. comparing said voltage difference of (b) with a reference coRrelation between known CO content of a gas and the voltage generated, thereby obtaining the CO concentration of said gas.
Claim 7
Independent Claim
111 words
A method for measuring the CO concentration of exhaust gas from an internal combustion engine comprising: a. admitting said exhaust gas to a first aqueous solution containing about 1.5 M HCl, 0.01 M FeCl3, 0.001 M FeCl2 and about 0.1 M PdCl2 catalyst; b. measuring the voltage difference between said first aqueous solution exposed to said exhaust gas and a second aqueous solution of the same composition as said first solution, said second solution not being exposed to said CO-containing gas; c. comparing said voltage difference of (b) with a reference coRrelation between known CO content of a gas and the voltage generated, thereby obtaining the CO concentration of said gas.
Claim 8
Dependent Claim
20 words
The method of claim 5 wherein the voltage sensitivity is adjusted by varying the concentration ratio of FeCl3 to FeCl2.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |