CN105486784A - Hydrogen flame ionization detector and working method thereof - Google Patents
Hydrogen flame ionization detector and working method thereof Download PDFInfo
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- CN105486784A CN105486784A CN201610049742.2A CN201610049742A CN105486784A CN 105486784 A CN105486784 A CN 105486784A CN 201610049742 A CN201610049742 A CN 201610049742A CN 105486784 A CN105486784 A CN 105486784A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/64—Electrical detectors
- G01N30/68—Flame ionisation detectors
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
Abstract
The invention relates to a hydrogen flame ionization detector and working method thereof. The hydrogen flame ionization detector comprises an outer cover, a chromatographic column, a collector, a polarization electrode, a conductive nozzle and a detection circuit. The collector is connected with the detection circuit after being connected with a polarization power source in series. The collector is connected with the negative pole of the polarization power source. The conductive nozzle is a ground potential. According to the hydrogen flame ionization detector, polarization voltage is connected to a signal outgoing line of the collector in series, meanwhile, the traditional polarization electrode and the nozzle are combined into a whole, the ground potential is kept, the normal function of the detector is ensured, and the equipment complexity and production technology are simplified.
Description
Technical field
The present invention relates to a kind of flame ionization ditector and method of work thereof, belong to the technical field of checkout equipment.
Background technology
Flame ionization ditector (FID) is typical destructiveness, mass flow rate sensitive detector; The flame generated with hydrogen and air burning is for excitaton source, when organic compound enters the flame with hydrogen and oxygen combustion, at high temperature produce chemi-ionization, ionization produces the ion of the several order of magnitude higher than base flow, under high-voltage electric field orientation, form ion current, faint ion current (10
-12~ 10
-8a) through high impedance (10
6~ 10
11Ω) amplifier amplifies, and becomes the electric signal be directly proportional to the organic compound amount entering flame, therefore can carry out quantitative test according to signal magnitude to organism.Its principal feature almost all has response to all organic compounds, almost equal to the relative response of all hydrocarbon compounds (carbon number >=3), also almost equal to the relative response containing heteroatomic hydro carbons Homologous Organic Compounds (carbon number >=3).
FID ionization chamber of the prior art is provided with metallic cylinder and makes outer cover, and there is nozzle at base center; Nozzle has annular metal circle (polarization pole, also known as emitter), there is a metallic cylinder (collector) upper end.Add the DC voltage of 90 ~ 300V between the two, form ionizing electric field, thus accelerate the ion of ionization.The ion current of collector trapping produces signal after high-impedance amplifier, and delivers to data acquisition system (DAS); Combustion gas, combustion-supporting gas and chromatographic column are introduced by base.
Flame ionization detector (FID) is primarily of ionization chamber and testing circuit composition.FID performance determines primarily of the ionization of analyte and collection efficiency, the former mainly with hydrogen/air than relevant, the latter and FID structure, the shape as nozzle inside diameter, collector, polarization pole is relevant with position, polarizing voltage etc.In traditional F ID organization plan, there are the following problems: be 1. hyper polarization voltage, polarization pole must with ground electric insulation, namely polarize pole adopt metal conductive materials, nozzle adopt isolation material, pole of then polarizing is combined with nozzle.Current nozzle many employings pottery or quartzy, polarization pole and nozzle many employings soldering combine, because the little technique of part causes difficulty of processing higher more.2. pole of polarizing adopts metal material, mostly is circular, require and nozzle same plane (polarization pole declines lower than nozzle sensitivity, otherwise noise increases), consistance is poor in batches.3.FID has two extension lines, adds structure complexity and maintenance cost.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of flame ionization ditector.
The present invention also provides a kind of method of work of above-mentioned flame ionization ditector.
Technical scheme of the present invention is as follows:
A kind of flame ionization ditector, comprises outer cover, chromatographic column, collector, polarization pole, conduction nozzle and testing circuit; Be connected with testing circuit after collector series connection polarization power supply, collector is connected with the negative pole of polarization power supply; Described conduction nozzle is earth potential.Polarizing voltage is connected in series in collector signal extension line by flame ionization ditector of the present invention, traditional polarization pole and nozzle are united two into one simultaneously, and remain on earth potential, while ensureing detecting device normal function, simplify equipment complexity and production technology.
Preferably, described conduction nozzle is conducting metal material.Conduction nozzle adopts metal material to make, and conveniently adopts Precision Machining, solves nozzle and requires high problem with polarization pole processing technology, be convenient to batch production, improve production efficiency and reduce production cost.
Preferred further, described conduction nozzle is stainless steel or nickel alloy material.
A kind of method of work of above-mentioned flame ionization ditector, comprise step as follows, chromatographic column effluent air first mixes with make-up gas (being generally nitrogen) and hydrogen, after mixing with combustion-supporting gas (air) again, lighted by ignition wire at conduction nozzle exit, form hydrogen flame; Flame heat energy and chemical energy is utilized organism to be ionized into the particle of band positive and negative charge; Conduction nozzle retentively current potential, collect very electronegative potential, electrostatic field E (direction of an electric field as shown in Figure 3) is formed after hyper polarization voltage between polarization pole and collector, charged particle displacement under electric field E effect forms micro-electric current, and micro-electric current is converted to voltage signal and amplifies rear output by testing circuit.
The usefulness of this invention is:
1, flame ionization ditector of the present invention, traditional nozzle and polarization pole are united two into one, nozzle naked requirement over the ground, avoid insulating material raises hydraulic performance decline risk with temperature, nozzle bore can directly be processed, also commercial stainless-steel tube can be adopted to replace, processing technology is simply ripe, improves batch consistance, flexibly and easily, simplify production technology, simplified design simultaneously;
2, flame ionization ditector of the present invention, only has a signal extension line, reduces FID external interface, and volume reduces, and structure is simple, and manufacturing technique requirent is low, saves production cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of flame ionization ditector of the prior art;
Fig. 2 is the structural representation of nozzle in flame ionization ditector of the prior art;
Fig. 3 is the structural representation of flame ionization ditector of the present invention;
Wherein, 1, collector; 2, polarization pole; 3, conduction nozzle; 4, chromatographic column; 5, make-up gas pipe; 6, hydrogen pipe; 7, air hose; 8, polarization power supply; 9, ignition wire; 10, thermopair; 11, testing circuit; 12, outer cover; 13, insulation nozzle.
Embodiment
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited thereto.
Embodiment 1
As shown in figs. 1 and 3.
A kind of flame ionization ditector, comprises outer cover 12, chromatographic column 4, collector 1, polarization pole 2, conduction nozzle 3 and testing circuit 11; Collector 1 is connected, and polarization power supply 8 is rear to be connected with testing circuit 11, and collector 1 is connected with the negative pole of polarization power supply 8; Described conduction nozzle is 3 earth potentials.Polarizing voltage is connected in series in collector 1 signal extension line by flame ionization ditector of the present invention, traditional polarization pole 2 and insulation nozzle 13 are united two into one simultaneously, and remain on earth potential, while ensureing detecting device normal function, simplify equipment complexity and production technology.
Embodiment 2
Flame ionization ditector as described in Example 1, its difference is, described conduction nozzle 3 is stainless steel.Conduction nozzle 3 adopts stainless steel to make, and conveniently adopts Precision Machining, solves insulation nozzle 13 and requires high problem with polarization pole 2 processing technology, be convenient to batch production, improve production efficiency and production cost.
Embodiment 3
A kind of method of work of flame ionization ditector as described in embodiment 1-2, comprise step as follows, chromatographic column 4 effluent air first mixes with make-up gas (nitrogen) and hydrogen, after mixing with combustion-supporting gas (air) again, lighted by ignition wire 9 in the exit of conduction nozzle 3, form hydrogen flame; The heat energy of flame and chemical energy is utilized organism to be ionized into the particle of band positive and negative charge; Conduction nozzle 3 retentively current potential, collector 1 is electronegative potential, electrostatic field E (direction as shown in Figure 3) is formed after hyper polarization voltage between polarization pole 2 and collector 1, charged particle displacement under the effect of electric field E forms micro-electric current, testing circuit 11 by micro-current magnification and convert to voltage signal export.
Claims (4)
1. a flame ionization ditector, is characterized in that, comprises outer cover, chromatographic column, collector, polarization pole, conduction nozzle and testing circuit; Be connected with testing circuit after collector series connection polarization power supply, collector is connected with the negative pole of polarization power supply; Described conduction nozzle is earth potential.
2. flame ionization ditector according to claim 1, is characterized in that, described conduction nozzle is conducting metal material.
3. flame ionization ditector according to claim 2, is characterized in that, described conduction nozzle is stainless steel or nickel alloy material.
4. the method for work of flame ionization ditector according to claim 1-3 any one, is characterized in that, comprise step as follows, chromatographic column effluent air first mixes with make-up gas and hydrogen, again with help combustion gas mixing after, lighted by ignition wire in the exit of conduction nozzle, form hydrogen flame; The heat energy of flame and chemical energy is utilized organism to be ionized into the particle of band positive and negative charge; Conduction nozzle retentively current potential, collect very electronegative potential, form electrostatic field E after hyper polarization voltage between polarization pole and collector, charged particle displacement under the effect of electric field E forms micro-electric current, and testing circuit is by micro-current magnification and convert voltage signal to and export.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610049742.2A CN105486784A (en) | 2016-01-25 | 2016-01-25 | Hydrogen flame ionization detector and working method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610049742.2A CN105486784A (en) | 2016-01-25 | 2016-01-25 | Hydrogen flame ionization detector and working method thereof |
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| CN105486784A true CN105486784A (en) | 2016-04-13 |
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| CN201610049742.2A Pending CN105486784A (en) | 2016-01-25 | 2016-01-25 | Hydrogen flame ionization detector and working method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505423A (en) * | 2017-07-19 | 2017-12-22 | 上海汉洁环境工程有限公司 | The automatic heat discharge module of flame ionization ditector |
| CN108088921A (en) * | 2017-12-12 | 2018-05-29 | 优泰科技（深圳）有限公司 | VOC on-line computing models |
| CN108333284A (en) * | 2018-02-08 | 2018-07-27 | 北京雪迪龙科技股份有限公司 | The method and its system of carbon compound are detected based on catalytic conversion technique |
| CN111562336A (en) * | 2020-06-16 | 2020-08-21 | 大连中汇达科学仪器有限公司 | Hydrogen flame ionization detector with hydrogenation effect |
| CN113325065A (en) * | 2021-06-16 | 2021-08-31 | 常州大恒环保科技有限公司 | Explosion detection method and device for organic waste gas |
| CN113917056A (en) * | 2021-12-15 | 2022-01-11 | 常州磐诺仪器有限公司 | Hydrogen flame ionization detector system with ultralow energy consumption and material consumption |
| WO2024192625A1 (en) * | 2023-03-20 | 2024-09-26 | aGILENT TECHNOLOGIES , INC. | Flame-based detectors with ignition promoter port |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505423A (en) * | 2017-07-19 | 2017-12-22 | 上海汉洁环境工程有限公司 | The automatic heat discharge module of flame ionization ditector |
| CN108088921A (en) * | 2017-12-12 | 2018-05-29 | 优泰科技（深圳）有限公司 | VOC on-line computing models |
| CN108333284A (en) * | 2018-02-08 | 2018-07-27 | 北京雪迪龙科技股份有限公司 | The method and its system of carbon compound are detected based on catalytic conversion technique |
| CN111551643A (en) * | 2018-02-08 | 2020-08-18 | 北京雪迪龙科技股份有限公司 | Method and system for detecting carbon-containing compound based on catalytic conversion technology |
| CN111562336A (en) * | 2020-06-16 | 2020-08-21 | 大连中汇达科学仪器有限公司 | Hydrogen flame ionization detector with hydrogenation effect |
| CN113325065A (en) * | 2021-06-16 | 2021-08-31 | 常州大恒环保科技有限公司 | Explosion detection method and device for organic waste gas |
| CN113917056A (en) * | 2021-12-15 | 2022-01-11 | 常州磐诺仪器有限公司 | Hydrogen flame ionization detector system with ultralow energy consumption and material consumption |
| CN113917056B (en) * | 2021-12-15 | 2022-05-13 | 常州磐诺仪器有限公司 | Hydrogen flame ionization detector system with ultralow energy consumption and material consumption |
| WO2024192625A1 (en) * | 2023-03-20 | 2024-09-26 | aGILENT TECHNOLOGIES , INC. | Flame-based detectors with ignition promoter port |
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Application publication date: 20160413 |
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