Automatic ignition detection control method of gas chromatography flame ionization detector (FID)

Abstract

The invention discloses an automatic ignition detection control method of a gas chromatography flame ionization detector (FID). The method comprises the following steps: starting a self-check program, performing self-check on an FID, a sampler and a column box; transmitting an ignition command, starting an FID ignition program; determining which path of FID needs to be ignited, and then judging whether air flow is smaller than the set internal air flow; if the air flow is smaller than the set internal air flow, igniting, if the air flow is not smaller than the set internal air flow, setting the sensitivity of the FID as 10<10>, setting the hydrogen flow increment, and judging whether the signal change of the FID is greater than 0.5mv; and if the signal change is greater than 0.5mv, judging successful ignition of the FID, if the signal change is not greater than 0.5mv, setting the hydrogen flow as a first ignition flow value, setting the air flow as a second ignition flow value, setting the tail blowing flow as a third ignition flow value, and then carrying out the ignition.

Description

technical field [0001] The invention belongs to the technical field of gas chromatography detection, in particular to a gas chromatography FID automatic ignition detection control method. Background technique [0002] Hydrogen flame ionization detector or flame ionization detector (flame ionization detector, FID) is one of the most commonly used detectors in gas chromatography. Its outstanding advantages are high sensitivity, wide linear range, and detection of almost all organic compounds. Both responded. It has reliable performance, simple structure, convenient operation, and its dead volume is almost zero. FID has been widely used no matter in the past packed column period, or capillary column has been popularized, and it is developing into comprehensive two-dimensional and fast gas chromatography today. [0003] For the flame ionization detector FID, whether the ignition step can be successfully completed is the prerequisite for the normal operation of the FID detector...

AI Technical Summary

Problems solved by technology

[0005] (1) There are bound to be many uncertainties in the manual control of ignition conditions. If any one of the conditions is not properly controlled, it will lead to ignition failure and may even cause damage to the machine;

[0006] (2) Manually confirming whether the ignition has been properly ignited has potential safety hazards, and it will also take a lot of time. In short, it is easy to make mistakes and the work is cumbersome

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