CN1945314A - Flame ionization detector - Google Patents
Flame ionization detector Download PDFInfo
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- CN1945314A CN1945314A CN 200610117377 CN200610117377A CN1945314A CN 1945314 A CN1945314 A CN 1945314A CN 200610117377 CN200610117377 CN 200610117377 CN 200610117377 A CN200610117377 A CN 200610117377A CN 1945314 A CN1945314 A CN 1945314A
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- nozzle
- spring
- flame ionization
- ionization detector
- nozzle cap
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Abstract
The flame ionization detector consists of sample port, hydrogen port, nozzle, air port, igniting coil and collector electrode, as well as nozzle cap, spring and shaft. Of the flame ionization detector, the shaft with flange is connected to the negative high voltage power source, the nozzle with nozzle cap possessing through hole constitutes the polarizing electrode, the spring has one end contacting the nozzle cap and the other end contacting the flange, and the igniting coil is mounted over the collector electrode. The present invention has high signal collecting efficiency of the collector electrode, lowered noise interference, and high sensitivity.
Description
Technical field
The present invention relates to gas chromatograph, particularly a kind of flame ionization detector.
Background technology
When material is carried out the composition analyzing and testing, gas chromatograph is a kind of common instrument, its principle of work is: with sample (the tested organic compound of gaseous state) and carrier gas, hydrogen, air input flame ionization detector (Flame ionization decetor, FID), through the hydrogen flame combustion, can produce a large amount of ions after the sample ionization, the polarizing voltage that negative high voltage power source produces attracts these ions to collector, the gas current that produces on the collector is directly proportional with the component that becomes in the sample, by detecting this electric current, after data processing, can measure the component content of its sample.
At present, the flame ionization detector of gas chromatograph, its ignition coil is connected with negative high voltage power source simultaneously, and is placed in the nozzle top.The ignition coil of this structure and the concentricity of nozzle are difficult to guarantee that signal noise is big; Polarized ion only depends on the ignition coil emission, and emitting area is little, so the ion collection rate is lower.Therefore directly have influence on the key technical indexes---the raising of sensitivity and minimum detectable level (MDL) of gas chromatograph.
Summary of the invention
The present invention is big in order to solve existing flame ionization detector signal noise, and collection rate is hanged down existing technical matters, and a kind of flame ionization detector of structurally having made significant improvement, having selected rational ignition coil material for use is provided.
According to above-mentioned purpose, the invention provides a kind of flame ionization detector, by sample port, hydrogen mouth, nozzle, air scoop, ignition coil, collector, also have nozzle cap, spring, axle to form; There is protruding circle the centre of its axis, and the one end is set with spring, and its other end is connected with negative high voltage power source; Wherein crown has the nozzle cap of through hole to be installed in the formation polarization utmost point on the nozzle; One end of its medi-spring and nozzle cap contacts side surfaces, the other end contacts with the protruding circle of axle; Wherein ignition coil is installed in the collector top.
Said apparatus, its medi-spring adopt nickel filament to make.
The present invention has improved the signal collection efficiency of collector owing to taked above technical measures, has reduced the signal noise interference, thereby has improved two the key technical indexes of gas chromatograph: measure highly sensitively, minimum detectable level is little.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
Embodiment
Be the flame ionization detector structural representation after a kind of gas chromatograph improves shown in the accompanying drawing,, also have nozzle cap 4, spring 6, axle 7 to form by sample port 1, hydrogen mouth 2, nozzle 3, air scoop 5, ignition coil 8, collector 9; There is protruding circle 7-2 the centre of its axis 7, and one end 7-1 is set with spring 6, and its other end 7-3 is connected with negative high voltage power source V, and wherein crown has the nozzle cap 4 of through hole to be installed in the formation polarization utmost point on the nozzle 3; One end of its medi-spring 6 and nozzle cap 4 contacts side surfaces, the other end contacts with the protruding circle 7-2 of axle 7; Wherein ignition coil 8 is installed in collector 9 tops.Wherein ignition coil 8 adopts cheap nickel filament to make, and to substitute expensive now platinum wire, can obtain same effect, thereby reduce manufacturing cost.
During instrument work, when the carrier gas band sample from sample port 1, hydrogen enters the FID bottom from hydrogen mouth 2, after the mixing back enters FID top from nozzle 3, ignition coil 8 is lighted mixed gas, in 3 mouthfuls of burnings of nozzle, the air that enters from air scoop 5 is a combustion adjuvant gas, by nozzle cap 4, the polarization utmost point that nozzle 3 constitutes burns and produces a large amount of ions, ion is under the polarizing voltage of negative high voltage power source V attracts, collected by the collector 9 that is positioned near the top flame, form gas current, instrument is by detecting this marking current, after data processing, get final product the component content in the show sample.
The maximum difference of this structure and original structure is:
1, the area of nozzle cap 3 is more much bigger than ignition coil 8, has increased the emitting area of polarized ion, has also improved the signal collection rate of collector 9, thereby has improved the measurement sensitivity of instrument, has reduced minimum detectable level, has significantly improved the technical feature of instrument.
2, negative high voltage power source V is connected by elastic component (spring 6) with the polarization utmost point, guarantees that spring 6 contacts with the good of nozzle cap 4, and easy to assembly, conduction is reliable.
3, ignition coil 8 separates with the polarizing voltage that negative high voltage power source V produces, and has avoided the concentricity difference problem of original structure ignition coil and nozzle, has reduced the signal noise interference.
In addition,,, also done corresponding improvement, become the flame ionization detector of a new generation as aspects such as collector support and signal output part, portfire, elastic connection structures to other structures of the present invention.
Claims (2)
1. a flame ionization detector by sample port (1), hydrogen mouth (2), nozzle (3), air scoop (5), ignition coil (8), collector (9), is characterized in that: also have nozzle cap (4), spring (6), axle (7) to form; There is protruding circle (7-2) centre of its axis (7), and one end (7-1) is set with spring (6), and its other end (7-3) (v) is connected with negative high voltage power source; Wherein crown has the nozzle cap (4) of through hole to be installed in the upward formation polarization utmost point of nozzle (3); One end of its medi-spring (6) and nozzle cap (4) contacts side surfaces, the other end contacts with the protruding circle (7-2) of axle (7); Wherein ignition coil (8) is installed in collector (9) top.
2. flame ionization detector according to claim 1 is characterized in that: its medi-spring (6) adopts nickel filament to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610117377 CN1945314A (en) | 2006-10-20 | 2006-10-20 | Flame ionization detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610117377 CN1945314A (en) | 2006-10-20 | 2006-10-20 | Flame ionization detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1945314A true CN1945314A (en) | 2007-04-11 |
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ID=38044809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610117377 Pending CN1945314A (en) | 2006-10-20 | 2006-10-20 | Flame ionization detector |
Country Status (1)
| Country | Link |
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| CN (1) | CN1945314A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010069212A1 (en) * | 2008-12-19 | 2010-06-24 | 中国科学院大连化学物理研究所 | Miniature hydrogen flame ionization detector |
| CN101858899A (en) * | 2010-05-14 | 2010-10-13 | 上海思达分析仪器有限责任公司 | Polarization structure of hydrogen flame ionization detector |
| CN101836111B (en) * | 2007-09-13 | 2013-03-20 | 拜尔技术服务有限责任公司 | Flame ionization detector |
| CN105067730A (en) * | 2015-07-30 | 2015-11-18 | 安徽中杰信息科技有限公司 | Hydrogen flame ionization detector for carrying out quantitative analysis on hydrocarbon mixture |
| CN105486784A (en) * | 2016-01-25 | 2016-04-13 | 潍坊学院 | Hydrogen flame ionization detector and working method thereof |
| CN107632100A (en) * | 2017-10-01 | 2018-01-26 | 江苏天瑞仪器股份有限公司 | A kind of flame ionization ditector |
| CN110261466A (en) * | 2019-06-21 | 2019-09-20 | 佛山速敏智能仪器科技有限公司 | A kind of FID method for controlling automatic ignition, device and FID based on VOCs detection |
-
2006
- 2006-10-20 CN CN 200610117377 patent/CN1945314A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101836111B (en) * | 2007-09-13 | 2013-03-20 | 拜尔技术服务有限责任公司 | Flame ionization detector |
| WO2010069212A1 (en) * | 2008-12-19 | 2010-06-24 | 中国科学院大连化学物理研究所 | Miniature hydrogen flame ionization detector |
| CN101858899A (en) * | 2010-05-14 | 2010-10-13 | 上海思达分析仪器有限责任公司 | Polarization structure of hydrogen flame ionization detector |
| CN105067730A (en) * | 2015-07-30 | 2015-11-18 | 安徽中杰信息科技有限公司 | Hydrogen flame ionization detector for carrying out quantitative analysis on hydrocarbon mixture |
| CN105486784A (en) * | 2016-01-25 | 2016-04-13 | 潍坊学院 | Hydrogen flame ionization detector and working method thereof |
| CN107632100A (en) * | 2017-10-01 | 2018-01-26 | 江苏天瑞仪器股份有限公司 | A kind of flame ionization ditector |
| CN110261466A (en) * | 2019-06-21 | 2019-09-20 | 佛山速敏智能仪器科技有限公司 | A kind of FID method for controlling automatic ignition, device and FID based on VOCs detection |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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