Low-voltage non-polarized FID (Flame Ionization Detector)

Abstract

A low-voltage non-polarized FID detector disclosed by the present invention comprises a collector, an ignition part and an ionization part, the collector is provided with a base, a collection cylinder arranged in the base, and an insulating part arranged between the collection cylinder and the base, the ionization part comprises an ionization seat and a nozzle installed in the ionization seat through a nozzle seat, and the ignition part is connected with the ignition part. A combustion cavity is formed in the upper end of the ionization base, the upper end of the nozzle is located in the combustion cavity, the top of the nozzle extends to the bottom of the collecting cylinder, the field intensity distance of 0.5 mm is formed between the top of the nozzle and the collecting cylinder, a first insertion hole for a conductive positive electrode to be inserted is formed in the side wall of the ionization base, and a second insertion hole for a conductive negative electrode to be inserted is formed in the side wall of the base. 20V low voltage is input to the ionization part through the conductive positive electrode and the conductive negative electrode so as to form an electric field. The low-voltage non-polarization FID detector disclosed by the invention is reasonable in structure and simple to assemble, and the input voltage value is reduced by shortening the field intensity distance, so that low-voltage non-polarization is realized.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a low-pressure non-polarization FID detector. Background technique [0002] FID is a flame ionization detector. It is a high-sensitivity general-purpose detector. It responds to almost all organic substances, but does not respond to inorganic substances, inert gases or substances that do not dissociate in flames. Small. The sensitivity of FID is 100-10000 times higher than that of thermal conductivity detector, the detection limit is 10-13g / s, it is not sensitive to temperature, and the response is fast. , is a gas chromatography detector with the best sensitivity to hydrocarbons, and is widely used in the detection of volatile hydrocarbons and many carbon-containing compounds. [0003] The existing FID detector has a complex structure and scattered parts, which makes it difficult to disassemble and assemble. In the traditional FID, a voltage of 200V is applied to the pol...

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Problems solved by technology

[0003] The existing FID detector has a complex structure and fragmented parts, which makes it difficult to disassemble and assemble. The traditional FID uses a 200V voltage to the polarizing ring to form a polarized electric field between the polarizing ring and the collecting tube, and passes through the pole The electric field collects the weak ion flow ionized by the hydrogen flame. This structure needs to be fed with 220V high voltage, so the assembly is prone to electric shock risk and the safety factor is low.

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