Fid gas phase detector

Hydrogen flame ionization detector（FID）It is one of the widely used detectors in gas chromatography, favored for its reliability, versatility, and ease of use.FIDIt can respond to almost all organic compounds and produce little or no signal to common carrier gases such as nitrogen and helium, making it highly sensitive and selective in the detection of organic compounds.

Fid gas phase detectorThe working principle of is to use the flame generated by the combustion of hydrogen and air as energy. When organic compounds enter the flame, due to ionization reactions, ions several orders of magnitude higher than the base flow are generated. These ions form an ion flow under the action of an electric field. The weak ion flow is amplified by high resistance and becomes an electrical signal proportional to the amount of organic compounds entering the flame, thereby achieving quantitative analysis of organic compounds.

FIDThe performance characteristics include:

High sensitivity: the detection limit can reach10^-12g·g^-1, which is nearly more sensitive than thermal conductivity detectors3An order of magnitude.

Wide linear dynamic range: greater than10^7 (±10%)Suitable for analysis from constants to trace amounts.

Quick response: The response time is only1msSuitable for rapid gas chromatography applications.

Usability: Easy to operate, easy to maintain, with flame out detection and automatic reignition functions.

in useFIDWhen doing so, it is important to pay attention to the following points:

Three gas sources are required: nitrogen as the carrier gas, hydrogen as the combustion gas, and air as the auxiliary gas.

Optimization of gas flow rate: The ratio of hydrogen and air flow rates has a direct impact on the sensitivity of the detector. The recommended hydrogen flow rate is generally30~40 mL/minThe air flow rate is300~400 mL/min.

Safety: Due to the use of hydrogen, it is necessary to pay attention to explosion-proof safety and avoid hydrogen leakage and accumulation.

Temperature control:FIDThe ignition and operation require certain temperature conditions, usually the detector temperature is not lower than120℃。

Fid gas phase detectorWidely used in environmental monitoring, food safety testing, petrochemicals, biochemistry and other fields, especially in the analysis of volatile organic compounds, it performs well. Used in gas chromatographs produced by companies such as AgilentFIDCan be achieved in a single injectionppbLevel to hundred level detection and quantitative analysis, with full range digital data output capability, capable of analyzing the entire range10^7Quantitative analysis of peaks within the concentration range.

In short,FIDIt is an efficient, sensitive, and widely used gas chromatography detector with important practical value for the detection of organic compounds.