GB1512002A – Gas monitors
– Google Patents
GB1512002A – Gas monitors
– Google Patents
Gas monitors
Info
Publication number
GB1512002A
GB1512002A
GB2841/74A
GB284174A
GB1512002A
GB 1512002 A
GB1512002 A
GB 1512002A
GB 2841/74 A
GB2841/74 A
GB 2841/74A
GB 284174 A
GB284174 A
GB 284174A
GB 1512002 A
GB1512002 A
GB 1512002A
Authority
GB
United Kingdom
Prior art keywords
liquid
datum
constituent
anode
transmission characteristics
Prior art date
1975-04-22
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2841/74A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Steel Corp
Original Assignee
British Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1975-04-22
Filing date
1975-04-22
Publication date
1978-05-24
1975-04-22
Application filed by British Steel Corp
filed
Critical
British Steel Corp
1975-04-22
Priority to GB2841/74A
priority
Critical
patent/GB1512002A/en
1978-05-24
Publication of GB1512002A
publication
Critical
patent/GB1512002A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
G01N27/416—Systems
G01N27/42—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte
G01N27/44—Measuring deposition or liberation of materials from an electrolyte; Coulometry, i.e. measuring coulomb-equivalent of material in an electrolyte using electrolysis to generate a reagent, e.g. for titration
G—PHYSICS
G01—MEASURING; TESTING
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 – G01N31/00
G01N33/0004—Gaseous mixtures, e.g. polluted air
G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
G01N33/0011—Sample conditioning
G01N33/0013—Sample conditioning by a chemical reaction
Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
1512002 Monitoring concentration of a gas BRITISH STEEL CORP 22 April 1975 [22 Jan 1974] 02841/74 Headings G1A and G1B A method for monitoring the toxic constituent of an ambient gas comprises bringing the gas into contact with a liquid having one component in which the constituent is selectively soluble and an indicator having optical transmission characteristics responsive to the quantity of constituent in solution, passing an electric current representative of the change in transmission characteristics from a datum through the liquid in which a second component is arranged to electrolyze, thereby to neutralize changes in the first component arising from the dissolved constituent and hence restore the transmission characteristics to the datum. A suction pump connected to outlet tube 6 draws air contaminated by sulphur dioxide through inlet tube 10 and a water based liquid containing hydrogen peroxide, methyl orange, and sodium chloride. The SO 2 is oxidized by the H 2 O 2 to sulphuric acid which produces a colour change in the methyl orange and an out-of-balance condition in the light received from lamp 20 in photo-electric cells 26 and 28. An out-of-balance signal is applied to an amplifier 48 which controls a power transistor T supplying current between the silver anode 11 and platinum wire cathode 16 of the cell 2. The NaCl is electrolyzed to sodium hydroxide, which neutralizes the H 2 SO 4 , and chlorine, which is retained in the cylinder 12 by a semi-permeable membrane 14 in the form of an agar plug on a sintered glass disc. The chlorine reacts with the silver of the anode to form an inert chloride. The instantaneous current between anode and cathode is indicative of instantaneous SO 2 concentration in the air and is applied for display to a recorder by means of the resistance network 52. The datum pH of the liquid is selected to lie between 3À9 and 4À0 by the initial addition of hydrochloric acid and the outputs of amplifiers 40, 42 are balanced by potentiometer 27 so that amplifier 44 produces a zero output at the datum condition. For increased sensitivity the methyl orange may be replaced by bromocresol green. For monitoring carbon monoxide the liquid in container 4 comprises dimethylformamide with an indicator of thymolphthalein, potassium iodide, ethanolamine and water. The contaminated air is first passed through absorption tubes containing respectively in sequence; silica gel to remove moisture, soda asbestos to remove carbon dioxide, magnesium perchlorate to remove moisture, molecular sieve to remove hydrocarbons and iodine pentoxide to convert CO to CO 2 for titration in cell 2. This method may be adapted to monitor carbon dioxide concentration by omitting the absorption tube containing soda asbestos.
GB2841/74A
1975-04-22
1975-04-22
Gas monitors
Expired
GB1512002A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB2841/74A
GB1512002A
(en)
1975-04-22
1975-04-22
Gas monitors
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB2841/74A
GB1512002A
(en)
1975-04-22
1975-04-22
Gas monitors
Publications (1)
Publication Number
Publication Date
GB1512002A
true
GB1512002A
(en)
1978-05-24
Family
ID=9746968
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2841/74A
Expired
GB1512002A
(en)
1975-04-22
1975-04-22
Gas monitors
Country Status (1)
Country
Link
GB
(1)
GB1512002A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2586108A1
(en)
*
1985-08-07
1987-02-13
Commissariat Energie Atomique
METHOD AND DEVICE FOR TIME-CONTINUOUS MEASUREMENT OF CONCENTRATION OF AEROSOLS IN A GAS
GB2184230A
(en)
*
1985-12-17
1987-06-17
Tokyo Gas Co Ltd
A method of measuring minor ingredient of gas and apparatus therefor
1975
1975-04-22
GB
GB2841/74A
patent/GB1512002A/en
not_active
Expired
Cited By (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
FR2586108A1
(en)
*
1985-08-07
1987-02-13
Commissariat Energie Atomique
METHOD AND DEVICE FOR TIME-CONTINUOUS MEASUREMENT OF CONCENTRATION OF AEROSOLS IN A GAS
EP0213031A2
(en)
*
1985-08-07
1987-03-04
Commissariat A L’energie Atomique
Method and device for the continuous measurement of the concentration of aerosols in a gas
EP0213031A3
(en)
*
1985-08-07
1989-04-05
Commissariat A L’energie Atomique
Method and device for the continuous measurement of the concentration of aerosols in a gas
GB2184230A
(en)
*
1985-12-17
1987-06-17
Tokyo Gas Co Ltd
A method of measuring minor ingredient of gas and apparatus therefor
GB2184230B
(en)
*
1985-12-17
1989-08-23
Tokyo Gas Co Ltd
Method of measuring minor ingredient of gas and apparatus therefor
Similar Documents
Publication
Publication Date
Title
US5071526A
(en)
1991-12-10
Acidic gas sensors and method of using same
EP0496527A1
(en)
1992-07-29
Gas sensor
US3763025A
(en)
1973-10-02
Method and apparatus for measuring nitrogen oxides and sulfur dioxideconcentrations
US4578154A
(en)
1986-03-25
Method and apparatus for measuring dissolved gas concentrations
GB1264441A
(en)
1972-02-23
US3871827A
(en)
1975-03-18
Apparatus for determining small amounts of carbon monoxide or hydrogen in atmospheric air
GB2042736A
(en)
1980-09-24
Electrochemical chlorine detecting cell
GB1512002A
(en)
1978-05-24
Gas monitors
FR2689635B1
(en)
1994-07-01
PROCESS FOR MEASURING THE CONCENTRATION OF CARBON GAS DISSOLVED IN SEA WATER AND DEVICE FOR IMPLEMENTING SAME.
Boulègue
1978
Electrochemistry of reduced sulfur species in natural waters—I. The H2S-H2O system
US4227887A
(en)
1980-10-14
Determination of total organic halides in water
US4235689A
(en)
1980-11-25
Apparatus for detecting traces of a gas
GB1438107A
(en)
1976-06-03
Gas pollution monitor
US3984204A
(en)
1976-10-05
Gas monitors
US3830709A
(en)
1974-08-20
Method and cell for sensing nitrogen oxides
Trojanowicz et al.
1982
Flow-injection potentiometric determination of residual chlorine in water
US5518602A
(en)
1996-05-21
Amperometric sensor
Boniface et al.
1971
The determination of carbon in steel by coulometric titration in partially aqueous medium
CN211955222U
(en)
2020-11-17
COD (chemical oxygen demand) measuring device for high-chlorine water sample
GB2000595A
(en)
1979-01-10
Arrangement for measuring oxygen concentrations
SU940044A1
(en)
1982-06-30
Electrochemical method for determination of steam partial pressure in gases and device for performing the same
Boniface et al.
1978
Continuous monitor for measuring toxic gases in steelworks atmospheres
EP0096117B1
(en)
1987-09-02
Analyzer for chemical oxidizing or reducing agents
JPH1172475A
(en)
1999-03-16
Electrochemical sensor for detecting chlorine in phosgene
Viré et al.
1977
Determination of naphthoquinones (K vitamins) and Methylene Blue with electrogenerated titanium (III)
Legal Events
Date
Code
Title
Description
1978-10-18
PS
Patent sealed
1987-12-09
PCNP
Patent ceased through non-payment of renewal fee
