EP0236441A1 - In der strömung sitzender gasfühler - Google Patents
In der strömung sitzender gasfühlerInfo
- Publication number
- EP0236441A1 EP0236441A1 EP86905622A EP86905622A EP0236441A1 EP 0236441 A1 EP0236441 A1 EP 0236441A1 EP 86905622 A EP86905622 A EP 86905622A EP 86905622 A EP86905622 A EP 86905622A EP 0236441 A1 EP0236441 A1 EP 0236441A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- porous body
- analyzer
- gaseous stream
- gases
- temperature
- 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.)
- Withdrawn
Links
- 239000007789 gas Substances 0.000 claims abstract description 56
- 230000035515 penetration Effects 0.000 claims abstract description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 6
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000013618 particulate matter Substances 0.000 claims description 3
- 229910052703 rhodium Inorganic materials 0.000 claims description 3
- 239000010948 rhodium Substances 0.000 claims description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 229910052741 iridium Inorganic materials 0.000 claims description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052763 palladium Inorganic materials 0.000 claims description 2
- 230000004044 response Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000012806 monitoring device Methods 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 4
- 239000000523 sample Substances 0.000 description 18
- 230000003197 catalytic effect Effects 0.000 description 10
- 239000003546 flue gas Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000005070 sampling Methods 0.000 description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012625 in-situ measurement Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004868 gas analysis Methods 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910001120 nichrome Inorganic materials 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- -1 pallidium Chemical compound 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- 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
- G01N33/0016—Sample conditioning by regulating a physical variable, e.g. pressure or temperature
Definitions
- the present invention relates to the manufacture of gas sensors generally and in particular to the manufacture of accurate combustible gas sensors which can be located in situ within a moving gaseous stream.
- Combustible gas sensors for the measurement of a high level of gases such as carbon monoxide and hydrogen have been prepared in the past. These sensors operate by measuring the temperature differential developed when the combustible gas is catalytically reacted with oxygen at the sensor.
- Two opposing temperature measuring devices are generally provided such that the output of the device is not a function of an individual sensor temperature but is instead a function of the temperature differential between the catalytic and reference portions of the sensor. Thermocouples, resistance thermometers, thermistors and other temperature sensitive devices can be used as the individual sensors.
- U.S. Patent No. 3,960,500 recognizing these problems and discloses and claims one "solution" to the above-recited difficulties by providing a closed loop sampling and analyzing system which returns the sampled and analyzed gas back to the same area from which the sample was drawn.
- the reference accomplishes its function by sealably mounting a sample probe and a return line to a duct containing exhaust gases.
- the sample probe draws a sample of the gases from the duct and conveys the sample to an analyzer assembly which establishes a control signal indicative of the concentration of a component of the gas.
- the analyzer assembly must then be connected to an aspirator which draws the analyzed sample from the analyzer assembly and conveys it back to the return line which exhausts the sample gas back into the duct where it may be exhausted along with the duct exhaust gases.
- Fig. 1 depicts an overall representation of the present invention configured for the in situ measurement of combustible components within a stream of flue gas effluent.
- Fig. 2 is a cut-away, partially sectioned detailed representation of the sensor device shown in Fig. 1.
- Fig. 3 represents a prospective, partially cutaway view of a further embodiment of the present invention.
- the present invention deals with a device useful for analyzing gases within a moving gaseous stream.
- the device comprises an analyzer means located within the stream which is capable of analyzing for said gases contained therein.
- Substantially surrounding the analyzer means is the combination of a substantially porous body and heater means. The combination allows the penetration of the gases to be analyzed but prevents fluctuations in the movement of the gaseous stream to substantially affect and render inaccurate the analyzer while maintaining the analyzer at a substantially constant temperature independent of temperature fluctuations within the gaseous stream.
- the sensing elements of the present invention are shown as elements 1 and 2 of Fig. 2 and 16 and 17 of Fig. 3. As previously noted, the sensing elements operate by measuring a temperature differential developed when the combustible gas is catalytically reacted with oxygen at the sensor. Elements 1 and 16 are characteristically coated with a high surface area oxidation catalyst while opposing elements 2 and 17 are coated with an inactive material. The active catalyst coating acts to catalyze the exothermic oxidation of combustible gases such as CO and H 2 while the inactive device remains insensitive thereto. The heat liberated in the catalytically promoted oxidation reactions results in a temperature differential between catalytic and refere ⁇ ce temperature measuring devices.
- the particular method of applying the catalytic coating, as well as the catalytic coating itself, such as Group VIII metals-platinum, palladium, iridium and rhodium, and combinations thereof, is taught by U.S. Patent No. 4,355,056, the disclosure of which is incorporated herein by reference.
- the temperature-sensitive elements can consist of thermocouple junctions as described in U.S. Patent No. 4,355,056 or, alternatively, the elements can consist of thin film platinum resistors forr ⁇ ed on an alumina plate which is available commercially from a variety of sources including Degussa Corp. of South Plainfield, New Jersey and Heraeus-Volkert of Queens Village, New York.
- Such resistance elements preferrably have a physical dimension of approximately 3 mm by 10 mm by 0.5 mm in thickness and exhibit a resistance at room temperature of approximately 1,000 ohms.
- the catalytic and noncatalytic elements used for gas analysis are placed within stack 40 directly in a flowing gas stream 41 such as a flue gas stack from a boiler.
- a flowing gas stream 41 such as a flue gas stack from a boiler.
- Such a stack has a large fluctuating velocity and the gas temperature also fluctuates depending upon ambient temperature and boiler load.
- Only through the practice of the present invention is one able to achieve a stable signal independent of stack gas velocity and temperature. This is accomplished by not only providing a heater means capable of maintairiing the analyzer at a substantially constant temperature independent of the temperature of the gaseous stream, but also by providing a substantially porous body located proximate the analyzer means.
- the porous body is characterized as (1) being capable of allowing the penetration of the gaseous stream therethrough so that gases can contact and be analyzed by the analyzer means, (2) preventing fluctuations in the movement of the gas stream to substantially affect and render inaccurate the analyzer and (3) maintaining the analyzer means at a constant temperature.
- the heater and porous body can be configured as a unitary element, and this preferred embodiment is depicted in Fig. 2.
- porous body 4 can be comprised of any material which is not catalytically active for the measurement reaction and which is sufficiently porous to perform the intended function.
- porous body 4 must not catalyze any reactions to remove CO or react with CO or O 2 , thus interfering with the measurement.
- Porous body 4 should also be resistant to degradation at those temperatures which are anticipated being encountered within gas stream 41.
- Suitable materials for construction are ceramics such as alumina, silica, zirconia (ZrO 2 ), mullite, cordierite, magnesia, berylium oxide, as well as a wide variety of other ceramics, ideally which would be thermally conductive, the identity of which would clearly be obvious to a person skilled in the art upon review of this disclosure.
- metals such as steel, stainless steel or aluminum can be used if made porous.
- the porous body should broadly exhibit an average pore diameter of approximately 0.1 to 1,000 ⁇ , and more preferably 1 to 500 u, and most ideally 10 to 200 u.
- Elements 4 should also exhibit a void volume broadly between 5 to 80%, and more preferably 20 to 70%, and most preferably 40 to 60%.
- the heater means can consist of a helically wound, resistance wire 5 embedded within porous body 4.
- the resistance wire can consist of, for example, nichrome which will generate heat energy upon the application of an electric current.
- the heating wire can be mounted around the outside surface of the porous body and, in fact, means for heating other than a wire can be selected.
- a thin film resistance heater can be deposited on the inside surface of the porous ceramic or on its outside surface.
- a porous ceramic that has embedded within its structure electrically conductive material such as metal particles or carbon which will cause the generation of heat upon the application of a current.
- the composition of the heating elements be they embedded in porous body 4 or not, is that they not exhibit any catalytic activity for the measurement reaction.
- a heater winding composed of platinum, pallidium, rhodium or a variety of other catalytically active metals may just react and remove all or a portion of the CO prior to reaching the catalytic resistance element. If such heating means is contemplated, the wire, for instance, can be coated with an inactive material prior to use in the present environment.
- thermocouple 7 can be embedded within porous body 4 as a thermocouple whose leads pass through base 10 and pipe 11, emanating in electrical connection box 8 which is placed outside of stack 40 via flange 12.
- the thermocouple can be connected to a temperature controller, well-known in the art, to regulate power to the heater and maintain a constant temperature.
- the heater leads 6 can similarly be made to parallel the leads to the thermocouple 7.
- connector box 8 can be electrically connected via line 23 to the analyzer electronics.
- the electronics can consist of a wide variety of heat change-responsive devices.
- the temperature which is intended to be maintained by the heater depends, for the most part, upon the nature of the gas being analyzed. It is safe to say that for monitoring flue gas from a combustion process, one would not want to go below 60oC or risk water and acid mist condensation appearing on the surface of the analyzer. When employing a platinum catalyst for the analysis of CO concentration, one would generally operate at temperatures between approximately 150°C to 500°C or above with approximately 300°C being preferred.
- the porous body is ideally configured in a basically cylindrical shape shown by element 4 of Fig. 2, it can also be fabricated in a number of varying shapes. The only important design criteria is that the porous body be capable of allowing the penetration of the gaseous stream therethrough so that the gases can be contacted with and analyzed by the analyzer means while preventing fluctuations in the movement of the gaseous stream to substantially affect and render inaccurate the analyzer means.
- the substantially porous body comprises a box-like structure which fully encloses the analyzer means 16 and 17 wherein at least one wall 14 or 14A is porous.
- porous members 14 can be composed of any nonreactive porous material such as, ideally, an alpha-alumina ceramic having an average pore diameter of approximately 10 to 200 u and a void volume of approximately 40 to 60%.
- air can be controlled by a variety of means well-known to those skilled in the art, including the application of a constant pressure of air to a fixed orifice.
- Tube 13B can also be employed to calibrate the device while installed in a gas stream.
- analyzer zero can be adjusted while flowing a gas containing no combustibles while the full scale or span of the device can be adjusted when a gas containing combustibles such as CO is passed through tube 13B.
- Tube 13B can also be used to feed combustion air in an oxygen starved environment.
- the present invention include a substantially porous filter means 9 which substantially envelops substantially porous body 4.
- the porous filter is characterized as being capable of substantially filtering solid particulate matter which may be located in the gaseous stream from contacting substantially porous body 4, thus allowing the penetration of the gaseous stream therethrough so that the gases can contact and be analyzed by the analyzer means but preventing particulate matter from doing so.
- the outer filter also performs the function of mediating gas velocities in high velocity environments. As such, when gas velocities are relatively slow, the outer filter can be dispensed with.
- the outer filter which may be especially useful in coal-fired combustion applications where a large amount of ash is present in the flue gas, can be composed of the same composition as porous body 4. It can exhibit a porosity between 0 to 1,000 ⁇ , and more preferably between 1 to 400 ⁇ , and most ideally between 10 and 200 ⁇ .
- the same limitations previously discussed regarding the nonreactivity of porous body 4 apply to outer filter 9.
- the present invention include inlet tube 13A for carrying air proximate to the analyzer means.
- the present analyzer is intended to detect and measure the concentration of a combustible material in a gaseous stream.
- inlet tube 13A is provided which extends beyond flange 12 to the ambient. Tube 13A can feed air at a flow rate of 10 cc per minute to the space surrounding catalytic surface 1. The flow of
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Sampling And Sample Adjustment (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US77387085A | 1985-09-09 | 1985-09-09 | |
US773870 | 1996-12-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0236441A1 true EP0236441A1 (de) | 1987-09-16 |
EP0236441A4 EP0236441A4 (de) | 1988-04-27 |
Family
ID=25099571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19860905622 Withdrawn EP0236441A4 (de) | 1985-09-09 | 1986-09-04 | In der strömung sitzender gasfühler. |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0236441A4 (de) |
JP (1) | JPS63500743A (de) |
KR (1) | KR880700263A (de) |
CN (1) | CN86106172A (de) |
MX (1) | MX168184B (de) |
WO (1) | WO1987001453A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8928177D0 (en) * | 1989-12-13 | 1990-02-14 | City Tech | Flammable gas detection |
DE10100242A1 (de) * | 2001-01-05 | 2002-07-18 | Testo Gmbh & Co Kg | Vorrichtung für die Gasanalyse |
JP3833559B2 (ja) * | 2002-03-29 | 2006-10-11 | 本田技研工業株式会社 | ヒータ内蔵型ガスセンサの制御装置 |
US6862915B2 (en) | 2003-03-20 | 2005-03-08 | Rosemount Analytical Inc. | Oxygen analyzer with enhanced calibration and blow-back |
WO2008116474A1 (de) * | 2007-03-23 | 2008-10-02 | Daimler Ag | Gasversorgungsanordnung mit einem sensor zur erfassung einer messgrösse eines prozessgases |
DE102008042139A1 (de) * | 2008-09-16 | 2010-03-18 | Robert Bosch Gmbh | Abgastaugliche Schutzschichten für Hochtemperatur ChemFET Abgassensoren |
CN101655472B (zh) * | 2009-10-09 | 2013-02-20 | 丁五行 | 一种用于热导式气体检测的恒温绝热系统 |
DE102012002456A1 (de) * | 2012-02-08 | 2013-08-08 | Dräger Safety AG & Co. KGaA | Gassensor |
CN102967627B (zh) * | 2012-10-19 | 2014-12-03 | 中国船舶重工集团公司第七一八研究所 | 催化式氢气传感器 |
CN103616408B (zh) * | 2013-11-19 | 2015-10-14 | 昆明理工大学 | 一种基于光纤Bragg光栅的催化燃烧式气体浓度计及其使用方法 |
CN103634951B (zh) * | 2013-12-10 | 2016-02-03 | 无锡格林通安全装备有限公司 | 一种隔爆加热装置 |
CN104359949A (zh) * | 2014-11-06 | 2015-02-18 | 广州勒夫蔓德电器有限公司 | 一种气体浓度的测量方法 |
RU2593527C1 (ru) * | 2015-04-29 | 2016-08-10 | Открытое акционерное общество "Нефтяная компания "Роснефть" | Планарный термокаталитический сенсор горючих газов и паров |
EP3884789A1 (de) * | 2018-05-31 | 2021-09-29 | Japan Tobacco Inc. | Vorrichtung zur aromaerzeugung |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2925242A1 (de) * | 1979-06-22 | 1981-01-08 | Berger Gmbh & Co Gerhard | Messwandler fuer stroemende gas-luftgemische |
EP0133502A2 (de) * | 1983-08-05 | 1985-02-27 | Kraftwerk Union Aktiengesellschaft | Sonde zur Feststellung von brennbaren Gasen |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL275018A (de) * | 1961-02-24 | |||
US3421362A (en) * | 1965-04-30 | 1969-01-14 | Davis Emergency Equipment Co I | Device or apparatus for detecting in air the presence of combustible or inflammable gases |
US3607084A (en) * | 1968-12-02 | 1971-09-21 | Sun Electric Corp | Combustible gas measurement |
US3771960A (en) * | 1971-07-28 | 1973-11-13 | Ambac Ind | Gas analyzer |
US3999947A (en) * | 1974-10-11 | 1976-12-28 | Matsushita Electric Industrial Co., Ltd. | Reducing gas sensor and a method of producing the same |
SU813233A1 (ru) * | 1978-06-01 | 1981-03-15 | Андижанское Специальное Проектно- Конструкторское Бюро Объединения"Союзнефтеавтоматика" Министерстванефтяной Промышленности | Термокаталитический детекторгАзА |
US4325912A (en) * | 1980-07-01 | 1982-04-20 | Beckman Instruments, Inc. | Carbon monoxide detection apparatus |
US4305724A (en) * | 1980-08-04 | 1981-12-15 | Delphian Partners | Combustible gas detection system |
-
1986
- 1986-09-04 EP EP19860905622 patent/EP0236441A4/de not_active Withdrawn
- 1986-09-04 WO PCT/US1986/001828 patent/WO1987001453A1/en not_active Application Discontinuation
- 1986-09-04 JP JP61504946A patent/JPS63500743A/ja active Pending
- 1986-09-08 MX MX003676A patent/MX168184B/es unknown
- 1986-09-08 CN CN198686106172A patent/CN86106172A/zh active Pending
-
1987
- 1987-05-08 KR KR870700400A patent/KR880700263A/ko not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2925242A1 (de) * | 1979-06-22 | 1981-01-08 | Berger Gmbh & Co Gerhard | Messwandler fuer stroemende gas-luftgemische |
EP0133502A2 (de) * | 1983-08-05 | 1985-02-27 | Kraftwerk Union Aktiengesellschaft | Sonde zur Feststellung von brennbaren Gasen |
Non-Patent Citations (1)
Title |
---|
See also references of WO8701453A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPS63500743A (ja) | 1988-03-17 |
EP0236441A4 (de) | 1988-04-27 |
WO1987001453A1 (en) | 1987-03-12 |
KR880700263A (ko) | 1988-02-22 |
CN86106172A (zh) | 1987-06-03 |
MX168184B (es) | 1993-05-10 |
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