GB1497667A - Apparatus for detecting and indicating the presence in a fluid environment of a potentially dangerous constituent - Google Patents
Apparatus for detecting and indicating the presence in a fluid environment of a potentially dangerous constituentInfo
- Publication number
- GB1497667A GB1497667A GB18386/74A GB1838674A GB1497667A GB 1497667 A GB1497667 A GB 1497667A GB 18386/74 A GB18386/74 A GB 18386/74A GB 1838674 A GB1838674 A GB 1838674A GB 1497667 A GB1497667 A GB 1497667A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- produce
- alarm
- methane
- energized
- Prior art date
- 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
Links
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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/16—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by burning or catalytic oxidation of surrounding material to be tested, e.g. of gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/08—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for safeguarding the apparatus, e.g. against abnormal operation, against breakdown
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/10—AC or DC measuring bridges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Fire-Detection Mechanisms (AREA)
- Fire Alarms (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB18386/74A GB1497667A (en) | 1974-04-26 | 1974-04-26 | Apparatus for detecting and indicating the presence in a fluid environment of a potentially dangerous constituent |
US05/570,073 US4020480A (en) | 1974-04-26 | 1975-04-21 | Catalytic detecting apparatus for detecting combustible gases and vapors |
DE19752518354 DE2518354A1 (de) | 1974-04-26 | 1975-04-25 | Anzeige- und/oder ueberwachungsvorrichtung von gefaehrlichen bestandteilen der umwelt |
JP50050593A JPS6363857B2 (US06312121-20011106-C00033.png) | 1974-04-26 | 1975-04-25 | |
HK547/81A HK54781A (en) | 1974-04-26 | 1981-11-05 | Apparatus for detecting and indicating the presence in a fluid environment of a potentially dangerous constituent |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB18386/74A GB1497667A (en) | 1974-04-26 | 1974-04-26 | Apparatus for detecting and indicating the presence in a fluid environment of a potentially dangerous constituent |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1497667A true GB1497667A (en) | 1978-01-12 |
Family
ID=10111574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18386/74A Expired GB1497667A (en) | 1974-04-26 | 1974-04-26 | Apparatus for detecting and indicating the presence in a fluid environment of a potentially dangerous constituent |
Country Status (5)
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2195483A (en) * | 1986-09-29 | 1988-04-07 | Nittan Co Ltd | Environmental abnormality detection apparatus |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5333021Y2 (US06312121-20011106-C00033.png) * | 1975-07-09 | 1978-08-15 | ||
JPS5333020Y2 (US06312121-20011106-C00033.png) * | 1975-07-09 | 1978-08-15 | ||
US4088986A (en) * | 1976-10-01 | 1978-05-09 | Boucher Charles E | Smoke, fire and gas alarm with remote sensing, back-up emergency power, and system self monitoring |
FR2412055A1 (fr) * | 1977-12-19 | 1979-07-13 | Fadico | Appareil de mesure et de controle electrique muni d'organes assurant la securite du fonctionnement |
FR2517062A1 (fr) * | 1981-11-20 | 1983-05-27 | Charbonnages De France | Procede d'interrogation d'un detecteur de teneur en gaz combustible, dispositif pour sa mise en oeuvre et application a la detection de la teneur en methane |
US4480252A (en) * | 1981-12-14 | 1984-10-30 | International Telephone And Telegraph Corporation | Gas detector |
DE3243542A1 (de) * | 1982-11-25 | 1984-05-30 | Hans-Jörg Dipl.-Kfm. 4400 Münster Hübner | Verfahren und messgeraet zum messen und verarbeiten von kenngroessen der umgebungsatmosphaere, insbesondere von konzentrationen verschiedener gase im wetterstrom unter tage |
US5135488A (en) * | 1989-03-17 | 1992-08-04 | Merit Medical Systems, Inc. | System and method for monitoring, displaying and recording balloon catheter inflation data |
US5807749A (en) * | 1992-10-23 | 1998-09-15 | Gastec N.V. | Method for determining the calorific value of a gas and/or the Wobbe index of a natural gas |
NL9201845A (nl) * | 1992-10-23 | 1994-05-16 | Gastec Nv | Werkwijze voor het bepalen van de calorische waarde van een gas en/of de Wobbe index van aardgas. |
JP3564796B2 (ja) * | 1995-06-05 | 2004-09-15 | 株式会社デンソー | センサ装置及びセンサ装置の調整方法 |
US5831146A (en) * | 1996-05-09 | 1998-11-03 | Cts Corporation | Gas sensor with multiple exposed active elements |
LU90536B1 (en) * | 2000-03-01 | 2006-11-17 | Health And Safety Systems Hold | Method for operating a sensor. |
US7833482B2 (en) * | 2006-12-29 | 2010-11-16 | Honeywell International Inc. | Low power combustible gas sensor |
JP6363553B2 (ja) | 2015-04-08 | 2018-07-25 | 日本特殊陶業株式会社 | 流体状態検出装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2857251A (en) * | 1953-01-28 | 1958-10-21 | Atlantic Refining Co | Process and dual-detector apparatus for analyzing gases |
US2904406A (en) * | 1956-05-04 | 1959-09-15 | Nat Lead Co | Hydrocarbon detection |
US3147465A (en) * | 1960-12-27 | 1964-09-01 | Mine Safety Appliances Co | Methane alarm and control system |
US3505663A (en) * | 1965-12-20 | 1970-04-07 | Gen Motors Corp | Power source condition indicator |
US3543260A (en) * | 1968-07-24 | 1970-11-24 | Honeywell Inc | Self checking interuder and fire detector units and system |
US3678489A (en) * | 1971-02-08 | 1972-07-18 | Alexandr Nazarievich Scherban | Apparatus for determining the concentration of combustible gases and vapors |
US3801972A (en) * | 1971-06-23 | 1974-04-02 | Ambac Ind | Gas analyzer circuitry |
-
1974
- 1974-04-26 GB GB18386/74A patent/GB1497667A/en not_active Expired
-
1975
- 1975-04-21 US US05/570,073 patent/US4020480A/en not_active Expired - Lifetime
- 1975-04-25 DE DE19752518354 patent/DE2518354A1/de not_active Ceased
- 1975-04-25 JP JP50050593A patent/JPS6363857B2/ja not_active Expired
-
1981
- 1981-11-05 HK HK547/81A patent/HK54781A/xx unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2195483A (en) * | 1986-09-29 | 1988-04-07 | Nittan Co Ltd | Environmental abnormality detection apparatus |
GB2195483B (en) * | 1986-09-29 | 1990-07-04 | Nittan Co Ltd | Environmental abnormality detection apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS5116094A (US06312121-20011106-C00033.png) | 1976-02-09 |
JPS6363857B2 (US06312121-20011106-C00033.png) | 1988-12-08 |
HK54781A (en) | 1981-11-13 |
DE2518354A1 (de) | 1976-03-04 |
US4020480A (en) | 1977-04-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |
Effective date: 19950414 |