Flame ionization detector

A flame ionization and detector technology, applied in the field of gas chromatograph, can solve the problems of low collection rate and large signal noise, and achieve the effects of reducing signal noise interference, improving signal collection efficiency, and small detection limit

Inactive Publication Date: 2007-04-11
SHANGHAI PRECISION SCI INSTR
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  • Abstract
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Problems solved by technology

[0004] In order to solve the technical problems of high signal noise and low collection rate of existing flame ionization detectors, the prese

Method used

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  • Flame ionization detector

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Embodiment Construction

[0009] The accompanying drawing is a schematic diagram of the improved flame ionization detector structure of a gas chromatograph, consisting of a sample port 1, a hydrogen port 2, a nozzle 3, an air port 5, an ignition coil 8, a collector 9, and a nozzle Cap 4, spring 6, axle 7 are made up; Wherein the center of axle 7 has protruding ring 7-2, and its one end 7-1 is sheathed with spring 6, and its other end 7-3 is connected with negative high-voltage power supply V, and wherein cap top has through The nozzle cap 4 of the hole is installed on the nozzle 3 to form a polarized pole; one end of the spring 6 is in contact with the side of the nozzle cap 4, and the other end is in contact with the flange 7-2 of the shaft 7; wherein the ignition coil 8 is installed on the collector pole 9 above. Wherein the ignition coil 8 is made of cheap nickel-chromium wire to replace the current expensive platinum wire, which can achieve the same effect, thereby reducing the manufacturing cost. ...

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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 [0001] The invention relates to a gas chromatograph, in particular to a flame ionization detector. Background technique [0002] Gas chromatograph is a commonly used instrument for component analysis and detection of substances. Its working principle is: input the sample (gaseous organic compound to be measured), carrier gas, hydrogen, and air into a flame ionization detector (Flame ionization decetor, FID), after hydrogen flame combustion, a large number of ions will be generated after the sample is ionized, and the polarization voltage generated by the negative high-voltage power supply will attract these ions to the collector, and the ion current generated on the collector is proportional to the amount of components in the sample, through The current is detected, and after data processing, the component content of the sample can be determined. [0003] At present, the ignition coil of the flame ionization detector of the gas chromatograph is connected wit...

Claims

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Application Information

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IPC IPC(8): G01N30/68
Inventor 何国琛
Owner SHANGHAI PRECISION SCI INSTR
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